{"title":"21700 Charger","description":"\u003cdiv style=\"font-family: 'Inter', Arial, sans-serif; color: #1e293b; line-height: 1.8; width: 100%; text-align: left; padding: 10px 0;\"\u003e\n\n \u003c!-- 分类页介绍模块 --\u003e\n \u003cdiv style=\"margin-bottom: 40px;\"\u003e\n \u003ch2 style=\"font-size: 24px; font-weight: bold; color: #0f172a; border-left: 4px solid #ea580c; padding-left: 12px; margin-bottom: 15px;\"\u003ePremium 21700 Batteries \u0026amp; Smart Chargers\u003c\/h2\u003e\n \u003cp style=\"font-size: 16px; color: #475569; margin-bottom: 15px;\"\u003eA high-performance tactical or search flashlight is only as reliable as its power source. The \u003cstrong\u003e21700 lithium-ion battery\u003c\/strong\u003e has become the gold standard in the professional illumination industry, offering significantly higher capacity and discharge rates compared to traditional 18650 cells.\u003c\/p\u003e\n \u003cp style=\"font-size: 16px; color: #475569;\"\u003eAt SPERAS, we design power solutions built for extreme environments. Whether you need a \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003ecold-weather resistant battery\u003c\/strong\u003e\u003c\/span\u003e that won't die in freezing temperatures, or a \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003efast dual-slot smart charger\u003c\/strong\u003e \u003c\/span\u003eto keep your gear ready for duty, our power accessories ensure your flashlights perform at peak output when you need them most.\u003c\/p\u003e\n \u003c\/div\u003e\n\n \u003c!-- 优势提炼 --\u003e\n \u003ch3 style=\"font-size: 20px; font-weight: bold; color: #0f172a; border-left: 4px solid #ea580c; padding-left: 12px; margin-bottom: 15px;\"\u003eWhy Trust SPERAS Power Solutions?\u003c\/h3\u003e\n \u003cul style=\"font-size: 16px; color: #334155; padding-left: 20px; margin-bottom: 40px; line-height: 1.8;\"\u003e\n \u003cli\u003e\n\u003cstrong\u003eBuilt-In Protection:\u003c\/strong\u003e Our batteries feature integrated protection circuits against overcharge, over-discharge, and short-circuiting for maximum safety.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eExtreme Weather Ready:\u003c\/strong\u003e Specialized cells designed to maintain stable voltage even in sub-zero outdoor conditions.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eEfficient Recharging:\u003c\/strong\u003e Modern Type-C USB charging technology ensures fast, safe, and universal power delivery.\u003c\/li\u003e\n \u003c\/ul\u003e\n\n \u003c!-- 核心产品内链模块 --\u003e\n \u003ch3 style=\"font-size: 22px; font-weight: bold; color: #0f172a; border-left: 4px solid #ea580c; padding-left: 12px; margin-bottom: 25px;\"\u003eEssential Power Accessories\u003c\/h3\u003e\n \u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 40px; justify-content: flex-start;\"\u003e\n \n \u003c!-- LTH45 电池卡片 --\u003e\n \u003cdiv style=\"flex: 1; min-width: 260px; background-color: #f8fafc; padding: 25px; border-radius: 8px; border: 1px solid #e2e8f0; box-shadow: 0 2px 4px rgba(0,0,0,0.02);\"\u003e\n \u003ch4 style=\"font-size: 18px; font-weight: bold; color: #ea580c; margin-top: 0;\"\u003eSPERAS LTH45 21700 Battery\u003c\/h4\u003e\n \u003cp style=\"font-size: 14px; font-weight: bold; color: #0f172a; margin-bottom: 10px;\"\u003e4500mAh Low-Temperature Power\u003c\/p\u003e\n \u003cp style=\"font-size: 14px; color: #475569; margin-bottom: 20px;\"\u003eStandard lithium batteries fail in the cold. The LTH45 is specifically engineered to conquer freezing environments, providing stable, high-drain power for your tactical and hunting flashlights when the temperature drops.\u003c\/p\u003e\n \u003ca style=\"display: inline-block; font-size: 14px; font-weight: bold; color: #fff; background-color: #ea580c; padding: 8px 16px; border-radius: 4px; text-decoration: none; transition: opacity 0.2s;\" href=\"https:\/\/sperasflashlight.com\/products\/speras-lth45-21700-lithium-batter-cold-weather-battery-flashlight-battery\"\u003eShop LTH45 Battery →\u003c\/a\u003e\n \u003c\/div\u003e\n\n \u003c!-- 双槽充电器卡片 --\u003e\n \u003cdiv style=\"flex: 1; min-width: 260px; background-color: #f8fafc; padding: 25px; border-radius: 8px; border: 1px solid #e2e8f0; box-shadow: 0 2px 4px rgba(0,0,0,0.02);\"\u003e\n \u003ch4 style=\"font-size: 18px; font-weight: bold; color: #ea580c; margin-top: 0;\"\u003eSPERAS Dual-Slot Smart Charger\u003c\/h4\u003e\n \u003cp style=\"font-size: 14px; font-weight: bold; color: #0f172a; margin-bottom: 10px;\"\u003eUniversal Type-C USB Charging\u003c\/p\u003e\n \u003cp style=\"font-size: 14px; color: #475569; margin-bottom: 20px;\"\u003eKeep your gear fully powered and ready for action. This smart charger features two independent slots and a convenient Type-C USB input. It automatically detects battery status and selects the optimal charging mode for safe, fast power.\u003c\/p\u003e\n \u003ca style=\"display: inline-block; font-size: 14px; font-weight: bold; color: #fff; background-color: #ea580c; padding: 8px 16px; border-radius: 4px; text-decoration: none; transition: opacity 0.2s;\" href=\"https:\/\/sperasflashlight.com\/products\/speras-21700-dual-slot-type-c-usb-battery-charger\"\u003eShop Smart Charger →\u003c\/a\u003e\n \u003c\/div\u003e\n \u003c\/div\u003e\n\n \u003c!-- 谷歌热搜 FAQ 模块 --\u003e\n \u003ch3 style=\"font-size: 22px; font-weight: bold; color: #0f172a; border-left: 4px solid #ea580c; padding-left: 12px; margin-bottom: 20px;\"\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n \u003cdiv style=\"margin-bottom: 40px;\"\u003e\n \u003cdetails style=\"background-color: #ffffff; padding: 15px; margin-bottom: 10px; border: 1px solid #cbd5e1; border-radius: 6px; cursor: pointer;\"\u003e\n \u003csummary style=\"font-size: 16px; font-weight: bold; color: #1e293b; outline: none;\"\u003eWhy are 21700 batteries better for high-lumen flashlights?\u003c\/summary\u003e\n \u003cp style=\"margin-top: 10px; font-size: 15px; color: #475569;\"\u003eThe 21700 battery is slightly larger than the older 18650 standard, allowing for a significant increase in capacity (like the 4500mAh in our LTH45) and a higher continuous discharge rate. This is absolutely essential for modern tactical and search flashlights that require massive power to sustain outputs of 3000 to 10,000 lumens.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails style=\"background-color: #ffffff; padding: 15px; margin-bottom: 10px; border: 1px solid #cbd5e1; border-radius: 6px; cursor: pointer;\"\u003e\n \u003csummary style=\"font-size: 16px; font-weight: bold; color: #1e293b; outline: none;\"\u003eDo regular lithium batteries work in freezing weather?\u003c\/summary\u003e\n \u003cp style=\"margin-top: 10px; font-size: 15px; color: #475569;\"\u003eStandard lithium-ion batteries suffer from severe voltage drops and capacity loss in sub-zero temperatures, often causing flashlights to shut off unexpectedly. If you are hunting, camping, or working in winter conditions, you need a specialized \u003cstrong\u003eLow-Temperature Lithium Battery\u003c\/strong\u003e like the SPERAS LTH45, which is formulated to perform reliably in extreme cold.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails style=\"background-color: #ffffff; padding: 15px; margin-bottom: 10px; border: 1px solid #cbd5e1; border-radius: 6px; cursor: pointer;\"\u003e\n \u003csummary style=\"font-size: 16px; font-weight: bold; color: #1e293b; outline: none;\"\u003eCan I charge 21700 batteries with a standard phone charger block?\u003c\/summary\u003e\n \u003cp style=\"margin-top: 10px; font-size: 15px; color: #475569;\"\u003eYes! The SPERAS Dual-Slot Battery Charger utilizes a universal \u003cstrong\u003eType-C USB input\u003c\/strong\u003e. This means you can plug the charging cable into standard wall adapters, power banks, car chargers, or solar panels, making it incredibly versatile for travel and outdoor use.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003c\/div\u003e\n\u003c\/div\u003e","products":[{"product_id":"speras-21700-dual-slot-type-c-usb-battery-charger","title":"SPERAS 21700 dual-slot Type C-USB battery charger","description":"\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eThe SPERAS ZL21\u003c\/strong\u003e is a portable dual-slot Type C-USB battery charger with each single slot max output of 1A, available for large-sized 21700, 18650 Lithium batteries and Capable of charging 2 batteries simultaneously and controlling each slot.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"426\"\u003e\n\u003cp\u003e\u003cspan\u003eInput\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"426\"\u003e\n\u003cp\u003e\u003cspan\u003eDC 5V\/2A\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"426\"\u003e\n\u003cp\u003e\u003cspan\u003eOutput Voltage\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"426\"\u003e\n\u003cp\u003e\u003cspan\u003e4.2V\u003c\/span\u003e±\u003cspan\u003e0.05\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"426\"\u003e\n\u003cp\u003e\u003cspan\u003eOutput Current\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"426\"\u003e\n\u003cp\u003e\u003cspan\u003e1000mA*2(Max)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"426\"\u003e\n\u003cp\u003e\u003cspan\u003eCharge\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"426\"\u003e\n\u003cp\u003e\u003cspan\u003eType C charge\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp\u003eSuitable lithium \/IMR batteries: \u003cstrong\u003e21700, 26650,18650, 18350, 16340(RCR123), 14500,\u003c\/strong\u003e 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14650, 16500, 16650, 17350, 17500, 17650, 17670, 18490, 18500, 20700, 22500, 22650, 25500, 266500\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/ZL21-1_29e2aff8-8721-46a4-a489-c41b29b01f3c.jpg?v=1641716729\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"SPERAS","offers":[{"title":"Default Title","offer_id":41281291845809,"sku":"SPERAS-ZL21","price":12.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/products\/ZL21-1.jpg?v=1641715128"},{"product_id":"speras-s50-21700-5000mah-battery","title":"SPERAS S50 21700 5000mAh Battery","description":"\u003cstyle\u003e\n \/* ========================================================= *\/\n \/* 基础样式重置与排版优化 (高级战术黑黄风格) *\/\n \/* ========================================================= *\/\n .speras-s50-pdp { font-family: 'Inter', -apple-system, BlinkMacSystemFont, Arial, sans-serif; color: #2c3e50; line-height: 1.6; max-width: 1000px; margin: 0 auto; padding: 20px; background: #fff; }\n .speras-s50-pdp h1, .speras-s50-pdp h2, .speras-s50-pdp h3 { margin-top: 0; line-height: 1.3; }\n \n \/* 🏆 Hero 顶部横幅 *\/\n .speras-hero-banner { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); padding: 50px 30px; border-radius: 20px; margin-bottom: 50px; text-align: center; border-bottom: 6px solid #eab308; box-shadow: 0 10px 25px rgba(0,0,0,0.15); }\n .speras-hero-banner h1 { font-size: 38px; font-weight: 900; color: #ffffff !important; margin: 0 0 15px 0; text-transform: uppercase; }\n .speras-hero-banner .subtitle { font-size: 18px; max-width: 850px; margin: 0 auto 20px auto; color: #cbd5e1 !important; line-height: 1.7; }\n \n \/* 极致稳定的左右图文模块 *\/\n .speras-feature-row { display: flex; flex-wrap: wrap; background: #fafafa; border-radius: 12px; border: 1px solid #e2e8f0; margin-bottom: 40px; overflow: hidden; align-items: center; box-shadow: 0 4px 6px rgba(0,0,0,0.02); }\n .speras-feature-text { flex: 1 1 340px; padding: 35px; box-sizing: border-box; }\n .speras-feature-img { flex: 1 1 340px; padding: 25px; text-align: center; box-sizing: border-box; }\n\n \/* 🏆 黑白双卡片 (安全保护 \u0026 质保) *\/\n .speras-safety-warranty-row { display: flex; flex-wrap: wrap; gap: 30px; margin-bottom: 40px; }\n .s50-safety-card { flex: 1 1 45%; background: #fafafa; border: 1px solid #e2e8f0; padding: 40px; border-radius: 12px; box-sizing: border-box; }\n .s50-warranty-card { flex: 1 1 45%; background: #1a1a1a; padding: 40px; border-radius: 12px; box-sizing: border-box; box-shadow: 0 10px 25px rgba(0,0,0,0.15); border-bottom: 4px solid #eab308;}\n \n .s50-safety-card h3 { color: #eab308; font-size: 24px; font-weight: bold; margin-top: 0; margin-bottom: 20px; }\n .s50-safety-card p, .s50-safety-card li { font-size: 16px; color: #475569; margin-bottom: 12px;}\n .s50-safety-card ul { padding-left: 20px; color: #475569; margin-bottom: 0;}\n \n .s50-warranty-card h3 { color: #eab308 !important; font-size: 24px; font-weight: bold; margin-top: 0; margin-bottom: 20px; border-bottom: 1px solid #334155; padding-bottom: 15px; }\n .s50-warranty-card p { font-size: 16px; color: #cbd5e1 !important; line-height: 1.8; margin-bottom: 15px;}\n .s50-warranty-card strong { color: #ffffff !important; }\n\n \/* 交叉销售\/内链专属推荐模块 *\/\n .speras-cross-sell { background: #fefce8; border-left: 5px solid #eab308; padding: 30px; margin-bottom: 40px; border-radius: 0 12px 12px 0; box-shadow: 0 4px 10px rgba(0,0,0,0.03); }\n .speras-cross-sell h3 { color: #b45309; font-size: 22px; margin-bottom: 15px; }\n .speras-cross-sell a { color: #ea580c; font-weight: bold; text-decoration: none; border-bottom: 2px solid transparent; transition: border-bottom 0.2s; }\n .speras-cross-sell a:hover { border-bottom: 2px solid #ea580c; }\n\n \/* 黑底参数 Box *\/\n .speras-specs-box { background: #1a1a1a; padding: 40px; border-radius: 16px; margin-bottom: 40px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); display: flex; flex-wrap: wrap; gap: 30px; }\n .speras-specs-box \u003e div { flex: 1 1 300px; box-sizing: border-box; }\n .speras-specs-box h2 { border-left: 5px solid #eab308; padding-left: 15px; color: #ffffff !important; margin-top: 0; margin-bottom: 20px;}\n .speras-specs-box ul { list-style: square; padding-left: 20px; color: #ffffff !important; margin: 0; }\n .speras-specs-box li { margin-bottom: 12px; color: #e2e8f0 !important; font-size: 16px; }\n .speras-specs-box strong { color: #eab308 !important; }\n\n \/* FAQ 手风琴样式 *\/\n .speras-faq details { background: #fff; border: 1px solid #cbd5e1; border-radius: 8px; margin-bottom: 15px; padding: 18px; cursor: pointer; transition: background 0.3s; }\n .speras-faq summary { font-size: 18px; font-weight: 700; color: #0f172a; outline: none; }\n .speras-faq details p { margin-top: 12px; margin-bottom: 0; color: #475569; }\n\n \/* 🚀 JS 灯箱放大效果 CSS *\/\n .s50-img-zoom { width: 100%; height: auto; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); display: block; margin: 0 auto; cursor: zoom-in; transition: transform 0.3s ease, box-shadow 0.3s ease; }\n .s50-img-zoom:hover { transform: scale(1.02); box-shadow: 0 8px 20px rgba(0,0,0,0.15); }\n #s50-lightbox { position: fixed; z-index: 2147483647; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(15, 23, 42, 0.95); display: flex; justify-content: center; align-items: center; opacity: 0; visibility: hidden; transition: opacity 0.3s ease; cursor: zoom-out; }\n #s50-lightbox.active { opacity: 1; visibility: visible; }\n #s50-lightbox img { max-width: 90vw; max-height: 90vh; border-radius: 8px; box-shadow: 0 10px 40px rgba(0,0,0,0.5); transform: scale(0.9); transition: transform 0.3s ease; }\n #s50-lightbox.active img { transform: scale(1); }\n\n \/* ========================================================= *\/\n \/* 📱 移动端万能防重叠修复补丁 (死锁在 .speras-s50-pdp 内) *\/\n \/* ========================================================= *\/\n @media screen and (max-width: 850px) {\n .speras-s50-pdp .speras-feature-row,\n .speras-s50-pdp .speras-specs-box,\n .speras-s50-pdp .speras-safety-warranty-row {\n display: block !important; \n padding: 15px 10px !important;\n margin-bottom: 20px !important;\n }\n \n .speras-s50-pdp .speras-feature-text, \n .speras-s50-pdp .speras-feature-img,\n .speras-s50-pdp .speras-specs-box \u003e div,\n .speras-s50-pdp .s50-safety-card,\n .speras-s50-pdp .s50-warranty-card {\n display: block !important;\n width: 100% !important;\n max-width: 100% !important;\n padding: 25px !important;\n margin: 0 0 20px 0 !important;\n box-sizing: border-box !important;\n }\n\n .speras-s50-pdp h1, .speras-s50-pdp h2, .speras-s50-pdp h3, \n .speras-s50-pdp p, .speras-s50-pdp span, .speras-s50-pdp li {\n white-space: normal !important;\n word-wrap: break-word !important;\n word-break: break-word !important;\n line-height: 1.6 !important;\n height: auto !important;\n }\n \n .speras-s50-pdp .speras-hero-banner h1 {\n font-size: 26px !important;\n line-height: 1.3 !important;\n }\n }\n\u003c\/style\u003e\n\u003cdiv class=\"speras-s50-pdp\"\u003e\n\u003cdiv class=\"speras-hero-banner\"\u003e\n\u003cspan style=\"display: inline-block; background: #eab308; color: #111; padding: 6px 18px; border-radius: 30px; font-size: 14px; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 15px;\"\u003eMaximum Power Output\u003c\/span\u003e\n\u003ch1\u003eSPERAS S50: 5000mAh 21700 Li-ion Battery\u003c\/h1\u003e\n\u003cp class=\"subtitle\"\u003eFuel your high-performance gear with the SPERAS S50. This premium 21700 rechargeable lithium-ion battery features a massive \u003cspan style=\"color: #eab308;\"\u003e\u003cstrong\u003e5000mAh capacity\u003c\/strong\u003e\u003c\/span\u003e and a high-drain \u003cspan style=\"color: #eab308;\"\u003e\u003cstrong\u003e15A max discharge rate\u003c\/strong\u003e\u003c\/span\u003e. Built with premium LG cells and comprehensive safety circuits, it guarantees peak performance and extreme reliability for your most demanding tactical and search flashlights.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; justify-content: center; gap: 15px; flex-wrap: wrap; margin-top: 15px; margin-bottom: 35px;\"\u003e\n\u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e🔋 5000mAh \/ 18.0Wh\u003c\/span\u003e \u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e⚡ 15A Max Discharge\u003c\/span\u003e \u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e🛡️ Triple Protection\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"max-width: 650px; margin: 0 auto;\"\u003e\u003cimg class=\"s50-img-zoom\" style=\"box-shadow: 0 8px 30px rgba(0,0,0,0.3);\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/5_aa3bd752-4eb3-4119-887c-d5a2c583e484.jpg?v=1776312409\" alt=\"SPERAS S50 5000mAh high capacity 21700 3.6V rechargeable Li-ion battery\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 28px; color: #1a1a1a; margin-top: 40px; margin-bottom: 30px; border-left: 5px solid #eab308; padding-left: 15px; font-weight: 800; text-transform: uppercase;\"\u003eUnleash True Performance\u003c\/h2\u003e\n\u003cdiv class=\"speras-feature-row\"\u003e\n\u003cdiv class=\"speras-feature-text\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #eab308; margin-top: 0;\"\u003ePremium LG Cell \u0026amp; High-Drain Output\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 15px;\"\u003eNot all batteries are created equal. The SPERAS S50 is powered by a 100% new, authentic \u003cstrong\u003eLG internal cell\u003c\/strong\u003e, guaranteeing true 5000mAh capacity without false advertising.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 0;\"\u003eWith a continuous discharging current of 9.8A and a \u003cstrong\u003emaximum burst of 15A\u003c\/strong\u003e, it easily drives high-lumen flashlights to their maximum Turbo output without voltage sagging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"speras-feature-img\"\u003e\u003cimg class=\"s50-img-zoom\" alt=\"SPERAS S50 21700 battery featuring LG cell and high drain 15A max current\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/1_57da44ee-50c0-49fe-8bd9-02d5ec784c05.jpg?v=1776312409\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"speras-safety-warranty-row\"\u003e\n\u003cdiv class=\"s50-safety-card\"\u003e\n\u003ch3\u003eIntelligent Safety Protections\u003c\/h3\u003e\n\u003cp\u003eSafety is our top priority. The S50 features a highly sophisticated built-in protection circuit board (PCB) to ensure the maximum lifespan of your battery and the safety of your devices.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple Defense:\u003c\/strong\u003e Prevents Over-charging, Over-discharging, and Short-circuiting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImpact Resistant:\u003c\/strong\u003e Features a unique structural design that protects the internal core from drops and severe shocks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"s50-warranty-card\"\u003e\n\u003ch3\u003eBacked by SPERAS Quality\u003c\/h3\u003e\n\u003cp\u003eWe stand behind our power sources. The SPERAS S50 comes with a comprehensive \u003cstrong\u003e1-Year Manufacturer Warranty\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIf you experience any performance issues or defects, we will exchange it or provide a new one immediately. Buy and operate your gear with absolute confidence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"speras-cross-sell\"\u003e\n\u003ch3\u003e🔦 The Perfect Power Source for SPERAS Flashlights\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; color: #475569; margin-bottom: 10px;\"\u003eThe S50 battery is specifically engineered to handle the extreme power demands of our professional lighting gear. It is the highly recommended primary or backup power source for:\u003c\/p\u003e\n\u003cul style=\"font-size: 16px; margin-bottom: 0; color: #475569;\"\u003e\n\u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003ca rel=\"noopener\" title=\"SPERAS P4 4000LM USB-C Charging Flashlight\" href=\"https:\/\/sperasflashlight.com\/products\/speras-p4-4000-lumen-search-flashlight-power-bank\" target=\"_blank\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eSPERAS P4 (4000 Lumens Searchlight)\u003c\/strong\u003e\u003c\/span\u003e \u003c\/a\u003e- Maximizes the P4's turbo output and ensures up to 167 hours of runtime.\u003c\/li\u003e\n\u003cli\u003eIt is also fully compatible with most standard high-drain 21700 flashlights on the market.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"speras-specs-box\"\u003e\n\u003cdiv\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e SPERAS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e S50\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Cell:\u003c\/strong\u003e LG Cell\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 5000mAh\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 3.6V (18.0Wh)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch2 style=\"color: transparent; border-left: none;\"\u003e \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCharging Current:\u003c\/strong\u003e 1A (Recommended), 2A (Max)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarging Current:\u003c\/strong\u003e 9.8A (Continuous), 15A (Max)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 75mm (Length) x 21.4mm (Diameter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet Weight:\u003c\/strong\u003e 72.8g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1 Year\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 28px; color: #1a1a1a; margin-top: 60px; margin-bottom: 20px; border-left: 5px solid #eab308; padding-left: 15px; font-weight: 800; text-transform: uppercase;\"\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\u003cdiv class=\"speras-faq\" style=\"margin-bottom: 50px;\"\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eCan I use this 21700 battery in an 18650 flashlight?\u003c\/summary\u003e\n\u003cp\u003eNo. The 21700 battery is larger (21.4mm diameter, 75mm length) than an 18650 battery. It will not fit in flashlights designed strictly for 18650 batteries. Please ensure your flashlight or device specifically supports 21700 sized batteries.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this a protected or unprotected battery?\u003c\/summary\u003e\n\u003cp\u003eThe SPERAS S50 is a \u003cstrong\u003eProtected\u003c\/strong\u003e battery. It features a built-in intelligent circuit board at the positive pole that actively prevents over-charging, over-discharging, and short circuits, making it exceptionally safe for daily use.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat kind of charger should I use?\u003c\/summary\u003e\n\u003cp\u003eWe recommend using a high-quality smart charger specifically designed for lithium-ion batteries. For optimal battery life, a charging current of 1A is recommended, though it safely supports up to 2A fast charging.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy does my high-lumen flashlight need a \"High Drain\" 15A battery?\u003c\/summary\u003e\n\u003cp\u003eHigh-performance flashlights (like the 4000-lumen SPERAS P4) require massive amounts of power instantly to reach their Turbo modes. Standard batteries will suffer from voltage drop and fail to activate Turbo. The S50's 15A max discharge rate easily handles these extreme power demands.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"s50-lightbox\"\u003e\u003cimg alt=\"Zoomed View\" id=\"s50-lightbox-img\"\u003e\u003c\/div\u003e\n\u003cscript\u003e\n \/\/ 使用纯 JS 拦截点击并触发灯箱，百分百避开 Shopify 主题的锚点劫持\n document.addEventListener('click', function(e) {\n if (e.target \u0026\u0026 e.target.classList.contains('s50-img-zoom')) {\n e.preventDefault();\n var lightbox = document.getElementById('s50-lightbox');\n var lightboxImg = document.getElementById('s50-lightbox-img');\n if (lightbox \u0026\u0026 lightboxImg) {\n lightboxImg.src = e.target.src;\n lightbox.classList.add('active');\n document.body.style.overflow = 'hidden'; \/\/ 防止背景滑动\n }\n } else if (e.target \u0026\u0026 (e.target.id === 's50-lightbox' || e.target.id === 's50-lightbox-img')) {\n var lightbox = document.getElementById('s50-lightbox');\n if (lightbox) {\n lightbox.classList.remove('active');\n document.body.style.overflow = ''; \/\/ 恢复背景滑动\n }\n }\n });\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SPERAS","offers":[{"title":"Default Title","offer_id":41281336475825,"sku":"SPERAS-S50","price":23.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/products\/SPERAS_S50.jpg?v=1776313424"},{"product_id":"speras-i4-4-slot-battery-charger-18650-fast-charger-21700-battery-charger","title":"SPERAS i4 Charger 4 slot Charger 21700 Charger","description":"\u003cstyle\u003e\n \/* 🏆 Hero Banner Style (Consistent with template) *\/\n .speras-hero-banner { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); padding: 50px 30px; border-radius: 20px; margin-bottom: 40px; text-align: center; border-bottom: 6px solid #ea580c; box-shadow: 0 10px 25px rgba(0,0,0,0.15); }\n .speras-hero-banner h1 { font-size: 38px; font-weight: 900; color: #ffffff !important; margin: 0 0 15px 0; line-height: 1.3; }\n .speras-hero-banner .subtitle { font-size: 18px; max-width: 850px; margin: 0 auto 20px auto; color: #cbd5e1 !important; line-height: 1.7; }\n \n \/* Comparison Table *\/\n .speras-table-wrapper { overflow-x: auto; margin: 40px 0; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); border: 1px solid #e2e8f0; }\n .speras-table { width: 100%; border-collapse: collapse; text-align: left; background-color: #fff; min-width: 600px; }\n .speras-table th, .speras-table td { padding: 16px 20px; border-bottom: 1px solid #e2e8f0; font-size: 16px; }\n .speras-table th { background-color: #0f172a; font-weight: bold; color: #fff; font-size: 16px; }\n .speras-table tr:hover { background-color: #f0f9ff; }\n .highlight-brand { font-weight: 700; color: #ea580c; background-color: #fff7ed; }\n .highlight-standard { font-weight: 600; color: #64748b; background-color: #f8fafc; }\n\n \/* Lightbox and Hover Effects *\/\n .speras-zoom { cursor: zoom-in; transition: transform 0.2s; }\n .speras-zoom:hover { transform: scale(1.02); }\n #speras-lightbox { position: fixed; z-index: 999999; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(15, 23, 42, 0.95); display: flex; justify-content: center; align-items: center; opacity: 0; visibility: hidden; transition: opacity 0.3s ease; cursor: zoom-out; }\n #speras-lightbox.active { opacity: 1; visibility: visible; }\n #speras-lightbox img { max-width: 90vw; max-height: 90vh; border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,0.5); transform: scale(0.9); transition: transform 0.3s ease; }\n #speras-lightbox.active img { transform: scale(1); }\n\n \/* ========================================================= *\/\n \/* 📱 移动端防重叠与防偏移修复补丁 (终极防线) *\/\n \/* ========================================================= *\/\n @media screen and (max-width: 850px) {\n .speras-pdp-container { padding: 10px !important; overflow: hidden !important; box-sizing: border-box !important; }\n \n \/* 强制打散所有 Flex 布局，变为上下单列，清除宽度限制 *\/\n .speras-pdp-container div[style*=\"display: flex\"] { display: block !important; padding: 15px !important; height: auto !important; }\n \n .speras-pdp-container div[style*=\"flex: 1\"] { \n display: block !important; \n width: 100% !important; \n max-width: 100% !important; \n min-width: 0 !important; \n margin-bottom: 20px !important; \n padding: 0 !important; \n box-sizing: border-box !important; \n }\n\n \/* 释放所有文字高度，强制重写行高，彻底消灭挤压和重叠 *\/\n .speras-pdp-container h1, .speras-pdp-container h2, .speras-pdp-container h3, \n .speras-pdp-container p, .speras-pdp-container span, .speras-pdp-container li,\n .speras-pdp-container td, .speras-pdp-container th, .speras-pdp-container summary,\n .speras-pdp-container a, .speras-pdp-container strong {\n white-space: normal !important;\n word-wrap: break-word !important;\n word-break: break-word !important;\n overflow-wrap: break-word !important; \n height: auto !important;\n max-height: none !important;\n }\n\n \/* 强制拉开标题和段落的行间距，防止上下行打架 *\/\n .speras-pdp-container h1 { font-size: 26px !important; line-height: 1.4 !important; }\n .speras-pdp-container h2 { font-size: 24px !important; line-height: 1.4 !important; margin-bottom: 15px !important; }\n .speras-pdp-container h3 { font-size: 20px !important; line-height: 1.5 !important; margin-bottom: 15px !important; }\n .speras-pdp-container p, .speras-pdp-container li, .speras-pdp-container td { line-height: 1.6 !important; font-size: 16px !important; }\n \n \/* 确保手机端图片100%居中，不偏移撑破屏幕 *\/\n .speras-pdp-container img { max-width: 100% !important; height: auto !important; margin: 0 auto !important; display: block !important; box-sizing: border-box !important; }\n }\n\u003c\/style\u003e\n\u003cdiv class=\"speras-pdp-container\" style=\"font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; color: #333; line-height: 1.7; max-width: 950px; margin: 0 auto;\"\u003e\n\u003cdiv class=\"speras-hero-banner\"\u003e\n\u003cspan style=\"display: inline-block; background: #ea580c; color: #fff; padding: 6px 18px; border-radius: 30px; font-size: 14px; font-weight: 800; text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 20px;\"\u003eStreamlined 4-Slot Power\u003c\/span\u003e\n\u003ch1\u003eSPERAS i4 Smart LED 4-Slot Battery Charger\u003c\/h1\u003e\n\u003cp class=\"subtitle\"\u003eMaximum reliability without the complexity. The \u003cstrong style=\"color: #ea580c;\"\u003eSPERAS i4\u003c\/strong\u003e is a rugged, highly efficient 4-bay charger featuring clear LED indicators, up to 2A fast charging in the fourth slot, and automatic intelligent charging modes (CC, CV, dv\/dt) to keep all your Li-ion and Ni-MH batteries performing at their peak.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 50px;\"\u003e\u003cimg class=\"speras-zoom\" style=\"display: block; margin: 0 auto; max-width: 500px; width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.05);\" alt=\"SPERAS i4 4-slot battery charger loaded with various Li-ion batteries including 21700 and 18650, alongside a USB-C cable\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/i4-2.jpg?v=1688475542\"\u003e\u003c\/div\u003e\n\u003ch2 style=\"font-size: 28px; font-weight: bold; color: #111; margin-bottom: 20px; text-align: center;\"\u003ei4 vs. D4S: Choose Your 4-Slot Charger\u003c\/h2\u003e\n\u003cp style=\"text-align: center; font-size: 16px; color: #555; max-width: 700px; margin: 0 auto 30px auto;\"\u003eNeed 4 charging slots? Choose between the streamlined, rugged efficiency of the i4 or the premium display feedback of the D4S.\u003c\/p\u003e\n\u003cdiv class=\"speras-table-wrapper\"\u003e\n\u003ctable class=\"speras-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth style=\"background-color: #334155;\"\u003ei4 (Streamlined Efficiency)\u003c\/th\u003e\n\u003cth style=\"background-color: #ea580c;\"\u003e\u003cspan style=\"color: rgb(255, 255, 255);\"\u003e\u003ca href=\"https:\/\/sperasflashlight.com\/products\/speras-d4s-4-slot-battery-charger-smart-lcd-charger\" target=\"_blank\" title=\"SPERAS D4S LCD Charger 21700 Charger\" style=\"color: rgb(255, 255, 255);\" rel=\"noopener\"\u003e🔥 D4S (Premium Display)\u003c\/a\u003e\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003eClear LED Indicator Bars\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003eHigh-Definition LCD Screen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharging Slots\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003e4 Independent Slots\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003e4 Independent Slots\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2A Fast Charging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003eDedicated 4th Slot\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003eAuto-Selected by Charger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBest For\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003eRugged, simple, cost-effective charging\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003eUsers who want exact voltage\/data readouts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 50px;\"\u003e\n\u003ch2 style=\"font-size: 28px; font-weight: bold; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 30px; text-align: center;\"\u003eCore Professional Features\u003c\/h2\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; margin-bottom: 40px; background: #fafafa; border-radius: 8px; overflow: hidden; border: 1px solid #f0f0f0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 30px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ff4500; margin-top: 0;\"\u003eIndependent Control \u0026amp; 2A Fast Charge\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 0;\"\u003eThe i4 controls each of its 4 slots completely independently. It is widely compatible with Li-ion and Ni-MH\/Ni-Cd batteries (including 21700, 26650, and 18650). Need power fast? The dedicated \u003cstrong\u003efourth slot provides up to 2A rapid charging speed\u003c\/strong\u003e to get your high-capacity cells ready in record time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px;\"\u003e\u003cimg class=\"speras-zoom\" style=\"width: 100%; height: 100%; object-fit: cover; display: block;\" alt=\"Top angle view of the SPERAS i4 LED charger powering multiple battery chemistries and sizes independently\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/i4-2.jpg?v=1688475542\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; margin-bottom: 40px; background: #fafafa; border-radius: 8px; overflow: hidden; flex-direction: row-reverse; border: 1px solid #f0f0f0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 30px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ff4500; margin-top: 0;\"\u003eSmart Modes \u0026amp; Ultimate Safety\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 0;\"\u003eBehind the simple LED interface is a highly intelligent core. The i4 automatically selects between 3 charging modes (\u003cstrong\u003eCC, CV, or dv\/dt\u003c\/strong\u003e) for optimal battery health. The chassis features an \u003cstrong\u003eexcellent heat dissipation design\u003c\/strong\u003e with built-in cooling vents, paired with robust reverse polarity and short circuit protection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px;\"\u003e\u003cimg class=\"speras-zoom\" style=\"width: 100%; height: 100%; object-fit: cover; display: block;\" alt=\"Bottom view of the SPERAS i4 battery charger showing cooling vents for heat dissipation and the detailed technical specifications label\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/i4-3.jpg?v=1688475560\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff; padding: 35px; border-radius: 8px; border-left: 6px solid #ea580c; border-top: 1px solid #eee; border-right: 1px solid #eee; border-bottom: 1px solid #eee; margin-bottom: 40px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #111; margin-top: 0; margin-bottom: 15px;\"\u003eOver-Discharged Battery Activation\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; color: #555; line-height: 1.8; margin-bottom: 0;\"\u003eDon't throw away \"dead\" batteries just yet. The SPERAS i4 features an advanced \u003cstrong\u003eLi-ion battery restoration function\u003c\/strong\u003e that can safely activate and revive over-discharged cells. Combined with automatic termination upon charging completion, it ensures your batteries are both recovered and protected from overcharging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 30px; margin-bottom: 50px;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; background: #f8f9fa; color: #333; padding: 30px; border-radius: 8px; border: 1px solid #eee;\"\u003e\n\u003ch2 style=\"font-size: 24px; font-weight: bold; color: #111; margin-top: 0; margin-bottom: 20px;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul style=\"font-size: 15px; line-height: 1.8; padding-left: 20px; margin-bottom: 0; color: #444;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eUSB Input:\u003c\/strong\u003e 5V\/2A\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eDC Output:\u003c\/strong\u003e DC 4.2V \/ 1A * 2 OR 2A * 1 OR 0.5A * 4\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eCompatible Batteries:\u003c\/strong\u003e 21700, 26650, 18650, 16340, 14500 Li-Ion, Ni-MH\/Ni-Cd, etc.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 110mm (L) * 48.4mm (W) * 28.9mm (H)\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 107.2g (net weight) \/ 146g (gross weight)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px; background: #fff; padding: 30px; border-radius: 8px; border: 1px solid #e0e0e0; box-shadow: 0 2px 8px rgba(0,0,0,0.02);\"\u003e\n\u003ch3 style=\"font-size: 24px; font-weight: bold; margin-top: 0; margin-bottom: 20px; color: #111;\"\u003e📦 What’s in the Box\u003c\/h3\u003e\n\u003cul style=\"font-size: 15px; line-height: 1.8; color: #555; padding-left: 20px; margin-bottom: 20px;\"\u003e\n\u003cli\u003e1 × SPERAS i4 Battery Charger\u003c\/li\u003e\n\u003cli\u003e1 × Charging Cable\u003c\/li\u003e\n\u003cli\u003e1 × Carrying Pouch\u003c\/li\u003e\n\u003cli\u003e1 × User Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cimg class=\"speras-zoom\" style=\"max-width: 100%; border-radius: 8px; margin-top: 10px;\" alt=\"SPERAS i4 battery charger retail packaging and contents including the unit, wrapped USB-C cable, and user manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/i4-4.jpg?v=1688475579\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 26px; font-weight: bold; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 30px;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 50px;\"\u003e\n\u003cdetails open=\"\" style=\"background: #fff; padding: 15px 20px; margin-bottom: 10px; border-radius: 6px; border: 1px solid #ddd; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.02);\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #222; outline: none;\"\u003eWhat is the main difference between the i4 and the D4S?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 15px; font-size: 16px; color: #555; line-height: 1.6;\"\u003eThe SPERAS i4 is a streamlined, highly reliable model that uses simple LED indicator bars to show charging progress. The D4S is the premium version that features a full LCD screen for exact digital readouts. Both safely charge 4 batteries independently.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #fff; padding: 15px 20px; margin-bottom: 10px; border-radius: 6px; border: 1px solid #ddd; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.02);\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #222; outline: none;\"\u003eWhich slot should I use for 2A fast charging?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 15px; font-size: 16px; color: #555; line-height: 1.6;\"\u003eOn the SPERAS i4, the \u003cstrong\u003efourth slot\u003c\/strong\u003e (far right) is specifically designed to provide up to 2A of rapid charging current. We recommend placing your highest-capacity batteries (like a 21700 or 26650) in this slot when you need them charged as quickly as possible.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #fff; padding: 15px 20px; margin-bottom: 10px; border-radius: 6px; border: 1px solid #ddd; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.02);\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #222; outline: none;\"\u003eWhat do the CC, CV, and dv\/dt charging modes mean?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 15px; font-size: 16px; color: #555; line-height: 1.6;\"\u003eThese are automatic smart charging phases designed to protect your battery. The i4 uses \u003cstrong\u003eCC (Constant Current)\u003c\/strong\u003e to charge quickly when the battery is low, switches to \u003cstrong\u003eCV (Constant Voltage)\u003c\/strong\u003e to safely top it off, and uses \u003cstrong\u003edv\/dt (Delta Voltage)\u003c\/strong\u003e termination for Ni-MH batteries to prevent overcharging.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n {\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"FAQPage\",\n \"mainEntity\": [{\n \"@type\": \"Question\",\n \"name\": \"What is the main difference between the i4 and the D4S?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"The SPERAS i4 is a streamlined, highly reliable model that uses simple LED indicator bars to show charging progress. The D4S is the premium version that features a full LCD screen for exact digital readouts. Both safely charge 4 batteries independently.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"Which slot should I use for 2A fast charging?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"On the SPERAS i4, the fourth slot (far right) is specifically designed to provide up to 2A of rapid charging current. We recommend placing your highest-capacity batteries (like a 21700 or 26650) in this slot when you need them charged as quickly as possible.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"What do the CC, CV, and dv\/dt charging modes mean?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"These are automatic smart charging phases designed to protect your battery. The i4 uses CC (Constant Current) to charge quickly when the battery is low, switches to CV (Constant Voltage) to safely top it off, and uses dv\/dt (Delta Voltage) termination for Ni-MH batteries to prevent overcharging.\"\n }\n }]\n }\n\u003c\/script\u003e \u003cdiv id=\"speras-lightbox\"\u003e\u003cimg alt=\"Enlarged view of SPERAS i4 charger\" id=\"speras-lightbox-img\"\u003e\u003c\/div\u003e\n\u003cscript\u003e\n document.addEventListener(\"DOMContentLoaded\", function() {\n var lightbox = document.getElementById('speras-lightbox');\n var lightboxImg = document.getElementById('speras-lightbox-img');\n var images = document.querySelectorAll('.speras-zoom');\n\n if (lightbox \u0026\u0026 lightboxImg) {\n images.forEach(function(img) {\n img.addEventListener('click', function(e) {\n e.preventDefault();\n lightboxImg.src = this.src;\n lightbox.classList.add('active');\n document.body.style.overflow = 'hidden';\n });\n });\n\n lightbox.addEventListener('click', function() {\n lightbox.classList.remove('active');\n document.body.style.overflow = '';\n setTimeout(function() {\n lightboxImg.src = '';\n }, 300);\n });\n }\n });\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SPERAS","offers":[{"title":"Default Title","offer_id":42784783335601,"sku":"i4","price":24.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/i4-1.jpg?v=1688475671"},{"product_id":"speras-d4s-4-slot-battery-charger-smart-lcd-charger","title":"SPERAS D4S LCD Charger 21700 Charger","description":"\u003cstyle\u003e\n \/* 🏆 Hero Banner Style *\/\n .speras-hero-banner { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); padding: 50px 30px; border-radius: 20px; margin-bottom: 40px; text-align: center; border-bottom: 6px solid #ea580c; box-shadow: 0 10px 25px rgba(0,0,0,0.15); }\n .speras-hero-banner h1 { font-size: 38px; font-weight: 900; color: #ffffff !important; margin: 0 0 15px 0; line-height: 1.3; }\n .speras-hero-banner .subtitle { font-size: 18px; max-width: 850px; margin: 0 auto 20px auto; color: #cbd5e1 !important; line-height: 1.7; }\n \n \/* Comparison Table *\/\n .speras-table-wrapper { overflow-x: auto; margin: 40px 0; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); border: 1px solid #e2e8f0; }\n .speras-table { width: 100%; border-collapse: collapse; text-align: left; background-color: #fff; min-width: 600px; }\n .speras-table th, .speras-table td { padding: 16px 20px; border-bottom: 1px solid #e2e8f0; font-size: 16px; }\n .speras-table th { background-color: #0f172a; font-weight: bold; color: #fff; font-size: 16px; }\n .speras-table tr:hover { background-color: #f0f9ff; }\n .highlight-brand { font-weight: 700; color: #ea580c; background-color: #fff7ed; }\n .highlight-standard { font-weight: 600; color: #64748b; background-color: #f8fafc; }\n\n \/* Lightbox and Hover Effects *\/\n .speras-zoom { cursor: zoom-in; transition: transform 0.2s; }\n .speras-zoom:hover { transform: scale(1.02); }\n #speras-lightbox { position: fixed; z-index: 999999; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(15, 23, 42, 0.95); display: flex; justify-content: center; align-items: center; opacity: 0; visibility: hidden; transition: opacity 0.3s ease; cursor: zoom-out; }\n #speras-lightbox.active { opacity: 1; visibility: visible; }\n #speras-lightbox img { max-width: 90vw; max-height: 90vh; border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,0.5); transform: scale(0.9); transition: transform 0.3s ease; }\n #speras-lightbox.active img { transform: scale(1); }\n\n \/* ========================================================= *\/\n \/* 📱 移动端防重叠与防偏移修复补丁 (终极防线) *\/\n \/* ========================================================= *\/\n @media screen and (max-width: 850px) {\n .speras-pdp-container { padding: 10px !important; overflow: hidden !important; box-sizing: border-box !important; }\n \n \/* 强制打散所有 Flex 布局，变为上下单列，清除宽度限制 *\/\n .speras-pdp-container div[style*=\"display: flex\"] { display: block !important; padding: 15px !important; height: auto !important; }\n \n .speras-pdp-container div[style*=\"flex: 1\"] { \n display: block !important; \n width: 100% !important; \n max-width: 100% !important; \n min-width: 0 !important; \n margin-bottom: 20px !important; \n padding: 0 !important; \n box-sizing: border-box !important; \n }\n\n \/* 释放所有文字高度，强制重写行高，彻底消灭挤压和重叠 *\/\n .speras-pdp-container h1, .speras-pdp-container h2, .speras-pdp-container h3, \n .speras-pdp-container p, .speras-pdp-container span, .speras-pdp-container li,\n .speras-pdp-container td, .speras-pdp-container th, .speras-pdp-container summary,\n .speras-pdp-container a, .speras-pdp-container strong {\n white-space: normal !important;\n word-wrap: break-word !important;\n word-break: break-word !important;\n overflow-wrap: break-word !important; \n height: auto !important;\n max-height: none !important;\n }\n\n \/* 强制拉开标题和段落的行间距，防止上下行打架 *\/\n .speras-pdp-container h1 { font-size: 26px !important; line-height: 1.4 !important; }\n .speras-pdp-container h2 { font-size: 24px !important; line-height: 1.4 !important; margin-bottom: 15px !important; }\n .speras-pdp-container h3 { font-size: 20px !important; line-height: 1.5 !important; margin-bottom: 15px !important; }\n .speras-pdp-container p, .speras-pdp-container li, .speras-pdp-container td { line-height: 1.6 !important; font-size: 16px !important; }\n \n \/* 确保手机端图片100%居中，不偏移撑破屏幕 *\/\n .speras-pdp-container img { max-width: 100% !important; height: auto !important; margin: 0 auto !important; display: block !important; box-sizing: border-box !important; }\n }\n\u003c\/style\u003e\n\u003cdiv class=\"speras-pdp-container\" style=\"font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; color: #333; line-height: 1.7; max-width: 950px; margin: 0 auto;\"\u003e\n\u003cdiv class=\"speras-hero-banner\"\u003e\n\u003cspan style=\"display: inline-block; background: #ea580c; color: #fff; padding: 6px 18px; border-radius: 30px; font-size: 14px; font-weight: 800; text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 20px;\"\u003eThe 4-Slot Powerhouse\u003c\/span\u003e\n\u003ch1\u003eSPERAS D4S Smart LCD 4-Slot Battery Charger\u003c\/h1\u003e\n\u003cp class=\"subtitle\"\u003eScale up your charging capabilities. The \u003cstrong style=\"color: #ea580c;\"\u003eSPERAS D4S\u003c\/strong\u003e is built for heavy users who demand efficiency. Featuring 4 fully independent charging slots, auto-selected rapid charging up to 2A, and a comprehensive LCD display, it keeps all your Li-ion and Ni-MH batteries primed and ready for action.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 50px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/SPERASD4S.jpg?v=1688475970\" alt=\"Top-down view of the SPERAS D4S 4-slot smart battery charger, highlighting the high-definition LCD screen displaying charging status, voltage, and current\" style=\"display: block; margin: 0 auto; max-width: 500px; width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.05);\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003ch2 style=\"font-size: 28px; font-weight: bold; color: #111; margin-bottom: 20px; text-align: center;\"\u003eD4S vs. ZT20: Which is right for you?\u003c\/h2\u003e\n\u003cp style=\"text-align: center; font-size: 16px; color: #555; max-width: 700px; margin: 0 auto 30px auto;\"\u003eWhether you need high-volume charging for multiple devices or precise battery capacity testing, SPERAS has a smart charger engineered for your specific needs.\u003c\/p\u003e\n\u003cdiv class=\"speras-table-wrapper\"\u003e\n\u003ctable class=\"speras-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth style=\"background-color: #334155;\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cspan style=\"color: rgb(255, 255, 255); text-decoration: underline;\"\u003e\u003ca rel=\"noopener\" style=\"color: rgb(255, 255, 255); text-decoration: underline;\" title=\"SPERAS ZT20 Smart Battery Charger \u0026amp; Tester with LCD\" href=\"https:\/\/sperasflashlight.com\/products\/speras-zt20-smart-battery-charger-18650-battery-tester\" target=\"_blank\"\u003eZT20 (Diagnostic Focus)\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/th\u003e\n\u003cth style=\"background-color: #ea580c;\"\u003e🔥 D4S (Volume Focus)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharging Slots\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003e2 Independent Slots\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003e4 Independent Slots\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Charging Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003e2A * 1 slot \/ 1A * 2 slots\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003e2A * 1 slot \/ 1A * 2 slots \/ 0.5A * 4 slots\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecial Feature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003eBattery Capacity Testing (mAh)\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003eAuto-Select Best Charging Current\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBest For\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003eTesting \u0026amp; restoring old batteries\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003eCharging many batteries quickly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 50px;\"\u003e\n\u003ch2 style=\"font-size: 28px; font-weight: bold; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 30px; text-align: center;\"\u003eCore Professional Features\u003c\/h2\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; margin-bottom: 40px; background: #fafafa; border-radius: 8px; overflow: hidden; border: 1px solid #f0f0f0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 30px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ff4500; margin-top: 0;\"\u003eIndependent 4-Slot Control\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 0;\"\u003eCharge different battery sizes and chemistries at the exact same time. The D4S accommodates up to 4 batteries simultaneously (including 21700, 26650, 18650, and Ni-MH\/Ni-Cd types). Each slot is controlled entirely independently, automatically detecting battery voltage to safely manage the charge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/D4S-2.jpg?v=1688475999\" alt=\"Side view of the SPERAS D4S plugged in via USB cable, actively charging multiple different battery sizes including 21700 and 18650 Li-ion cells\" style=\"width: 100%; height: 100%; object-fit: cover; display: block;\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff; padding: 35px; border-radius: 8px; border-left: 6px solid #ea580c; border-top: 1px solid #eee; border-right: 1px solid #eee; border-bottom: 1px solid #eee; margin-bottom: 40px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #111; margin-top: 0; margin-bottom: 15px;\"\u003eAuto-Select Current \u0026amp; Intelligent Restoration\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; color: #555; line-height: 1.8; margin-bottom: 0;\"\u003eMaximize your battery life effortlessly. The D4S \u003cstrong\u003eautomatically selects the optimal charging current\u003c\/strong\u003e (0.5A, 1.0A, or up to 2.0A maximum) based on battery status. It features automatic termination upon completion, alongside advanced safety protocols like \u003cstrong\u003ereverse polarity protection, short circuit defense\u003c\/strong\u003e, and a function dedicated to \u003cstrong\u003erestoring and activating over-discharged Li-ion batteries\u003c\/strong\u003e safely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 30px; margin-bottom: 50px;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; background: #f8f9fa; color: #333; padding: 30px; border-radius: 8px; border: 1px solid #eee;\"\u003e\n\u003ch2 style=\"font-size: 24px; font-weight: bold; color: #111; margin-top: 0; margin-bottom: 20px;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul style=\"font-size: 15px; line-height: 1.8; padding-left: 20px; margin-bottom: 0; color: #444;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eUSB Input:\u003c\/strong\u003e 5V\/2A\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eDC Output:\u003c\/strong\u003e DC 4.2V \/ 1A * 2 OR 2A * 1 OR 0.5A * 4\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eCompatible Batteries:\u003c\/strong\u003e 21700, 26650, 18650, 16340, 14500 Li-Ion, Ni-MH\/Ni-Cd, etc.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 122mm (L) * 97.6mm (W) * 31.5mm (H)\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 140g (net weight) \/ 218.3g (gross weight)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px; background: #fff; padding: 30px; border-radius: 8px; border: 1px solid #e0e0e0; box-shadow: 0 2px 8px rgba(0,0,0,0.02);\"\u003e\n\u003ch3 style=\"font-size: 24px; font-weight: bold; margin-top: 0; margin-bottom: 20px; color: #111;\"\u003e📦 What’s in the Box\u003c\/h3\u003e\n\u003cul style=\"font-size: 15px; line-height: 1.8; color: #555; padding-left: 20px; margin-bottom: 20px;\"\u003e\n\u003cli\u003e1 × SPERAS D4S Smart 4-Slot Charger\u003c\/li\u003e\n\u003cli\u003e1 × Charging Cable\u003c\/li\u003e\n\u003cli\u003e1 × Carrying Pouch\u003c\/li\u003e\n\u003cli\u003e1 × User Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/D4S-3.jpg?v=1688476015\" alt=\"SPERAS D4S complete retail packaging and included accessories: charging unit, carrying pouch, USB cables, and instruction manual\" style=\"max-width: 100%; border-radius: 8px; margin-top: 10px;\" class=\"speras-zoom\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 26px; font-weight: bold; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 30px;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 50px;\"\u003e\n\u003cdetails style=\"background: #fff; padding: 15px 20px; margin-bottom: 10px; border-radius: 6px; border: 1px solid #ddd; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.02);\" open=\"\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #222; outline: none;\"\u003eWhat is the difference between the SPERAS D4S and the ZT20?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 15px; font-size: 16px; color: #555; line-height: 1.6;\"\u003eThe primary difference is volume vs. diagnostics. The \u003cstrong\u003eD4S\u003c\/strong\u003e has 4 independent slots, allowing you to charge up to 4 batteries at once, making it ideal for users with lots of gear. The \u003cstrong\u003eZT20\u003c\/strong\u003e has 2 slots but includes a dedicated capacity testing feature (measuring exact mAh), making it better for diagnosing and testing older batteries.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #fff; padding: 15px 20px; margin-bottom: 10px; border-radius: 6px; border: 1px solid #ddd; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.02);\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #222; outline: none;\"\u003eCan I charge Li-ion and Ni-MH batteries at the same time?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 15px; font-size: 16px; color: #555; line-height: 1.6;\"\u003eAbsolutely. Because each of the 4 slots is controlled independently by the smart microcomputer, you can safely mix battery chemistries (like a Li-ion 18650 and a Ni-MH AA) and sizes simultaneously. The charger will automatically detect what is inserted and apply the correct voltage.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #fff; padding: 15px 20px; margin-bottom: 10px; border-radius: 6px; border: 1px solid #ddd; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.02);\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #222; outline: none;\"\u003eHow does the \"Automatic Current Selection\" work?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 15px; font-size: 16px; color: #555; line-height: 1.6;\"\u003eTo maximize the lifespan of your batteries, the D4S analyzes the internal resistance and state of the battery inserted. It will then automatically choose the safest and fastest charging current: 0.5A for smaller\/fuller batteries, 1.0A for standard charging, or up to 2.0A for rapid charging a single high-capacity cell.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n {\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"FAQPage\",\n \"mainEntity\": [{\n \"@type\": \"Question\",\n \"name\": \"What is the difference between the SPERAS D4S and the ZT20?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"The primary difference is volume vs. diagnostics. The D4S has 4 independent slots, allowing you to charge up to 4 batteries at once, making it ideal for users with lots of gear. The ZT20 has 2 slots but includes a dedicated capacity testing feature (measuring exact mAh), making it better for diagnosing and testing older batteries.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"Can I charge Li-ion and Ni-MH batteries at the same time?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"Absolutely. Because each of the 4 slots is controlled independently by the smart microcomputer, you can safely mix battery chemistries (like a Li-ion 18650 and a Ni-MH AA) and sizes simultaneously. The charger will automatically detect what is inserted and apply the correct voltage.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"How does the 'Automatic Current Selection' work?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"To maximize the lifespan of your batteries, the D4S analyzes the internal resistance and state of the battery inserted. It will then automatically choose the safest and fastest charging current: 0.5A for smaller\/fuller batteries, 1.0A for standard charging, or up to 2.0A for rapid charging a single high-capacity cell.\"\n }\n }]\n }\n\u003c\/script\u003e \u003cdiv id=\"speras-lightbox\"\u003e\u003cimg id=\"speras-lightbox-img\" alt=\"Enlarged view of SPERAS D4S charger\"\u003e\u003c\/div\u003e\n\u003cscript\u003e\n document.addEventListener(\"DOMContentLoaded\", function() {\n var lightbox = document.getElementById('speras-lightbox');\n var lightboxImg = document.getElementById('speras-lightbox-img');\n var images = document.querySelectorAll('.speras-zoom');\n\n if (lightbox \u0026\u0026 lightboxImg) {\n images.forEach(function(img) {\n img.addEventListener('click', function(e) {\n e.preventDefault();\n lightboxImg.src = this.src;\n lightbox.classList.add('active');\n document.body.style.overflow = 'hidden';\n });\n });\n\n lightbox.addEventListener('click', function() {\n lightbox.classList.remove('active');\n document.body.style.overflow = '';\n setTimeout(function() {\n lightboxImg.src = '';\n }, 300);\n });\n }\n });\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SPERAS","offers":[{"title":"Default Title","offer_id":42784787202225,"sku":"D4S","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/SPERASD4S_336b0b62-4d6a-4822-b5ca-e34759f2e728.jpg?v=1688476098"},{"product_id":"speras-pd21700-2-in-1-battery-charger-smart-battery-charger","title":"SPERAS PD2170 Power Bank Charger 21700 18650 Charger","description":"\u003cstyle\u003e\n \/* 🏆 Hero Banner Style *\/\n .speras-hero-banner { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); 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overflow: hidden !important; box-sizing: border-box !important; }\n \n \/* 强制打散所有 Flex 布局，变为上下单列，清除宽度限制 *\/\n .speras-pdp-container div[style*=\"display: flex\"] { display: block !important; padding: 15px !important; height: auto !important; }\n \n .speras-pdp-container div[style*=\"flex: 1\"] { \n display: block !important; \n width: 100% !important; \n max-width: 100% !important; \n min-width: 0 !important; \n margin-bottom: 20px !important; \n padding: 0 !important; \n box-sizing: border-box !important; \n }\n\n \/* 释放所有文字高度，强制重写行高，彻底消灭挤压和重叠 *\/\n .speras-pdp-container h1, .speras-pdp-container h2, .speras-pdp-container h3, \n .speras-pdp-container p, .speras-pdp-container span, .speras-pdp-container li,\n .speras-pdp-container td, .speras-pdp-container th, .speras-pdp-container summary,\n .speras-pdp-container a, .speras-pdp-container strong {\n white-space: normal !important;\n word-wrap: break-word !important;\n word-break: break-word !important;\n overflow-wrap: break-word !important; \n height: auto !important;\n max-height: none !important;\n }\n\n \/* 强制拉开标题和段落的行间距，防止上下行打架 *\/\n .speras-pdp-container h1 { font-size: 26px !important; line-height: 1.4 !important; }\n .speras-pdp-container h2 { font-size: 24px !important; line-height: 1.4 !important; margin-bottom: 15px !important; }\n .speras-pdp-container h3 { font-size: 20px !important; line-height: 1.5 !important; margin-bottom: 15px !important; }\n .speras-pdp-container p, .speras-pdp-container li, .speras-pdp-container td { line-height: 1.6 !important; font-size: 16px !important; }\n \n \/* 确保手机端图片100%居中，不偏移撑破屏幕 *\/\n .speras-pdp-container img { max-width: 100% !important; height: auto !important; margin: 0 auto !important; display: block !important; box-sizing: border-box !important; }\n }\n\u003c\/style\u003e\n\u003cdiv class=\"speras-pdp-container\" style=\"font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; color: #333; line-height: 1.7; max-width: 950px; margin: 0 auto;\"\u003e\n\u003cdiv class=\"speras-hero-banner\"\u003e\n\u003cspan style=\"display: inline-block; background: #ea580c; color: #fff; padding: 6px 18px; border-radius: 30px; font-size: 14px; font-weight: 800; text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 20px;\"\u003eThe Ultimate 2-in-1 Charging Device\u003c\/span\u003e\n\u003ch1\u003eSPERAS PD21700 Smart Battery Charger \u0026amp; Power Bank\u003c\/h1\u003e\n\u003cp class=\"subtitle\"\u003eDon't just charge your flashlights; charge your life. The \u003cstrong style=\"color: #ea580c;\"\u003eSPERAS PD21700\u003c\/strong\u003e isn't just a high-efficiency smart charger for your\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e \u003cstrong\u003e\u003ca rel=\"noopener\" title=\"SPERAS S50 21700 5000mAh Battery\" href=\"https:\/\/sperasflashlight.com\/products\/speras-s50-21700-5000mah-battery\" style=\"color: rgb(43, 0, 255);\" target=\"_blank\"\u003e21700\u003c\/a\u003e\u003c\/strong\u003e\u003c\/span\u003e and \u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003e\u003ca rel=\"noopener\" style=\"color: rgb(43, 0, 255);\" title=\"SPERAS S34 3400mAh 18650 Lithium Battery\" href=\"https:\/\/sperasflashlight.com\/products\/speras-s34-3400mah-18650-lithium-battery\" target=\"_blank\"\u003e18650\u003c\/a\u003e\u003c\/strong\u003e\u003c\/span\u003e batteries. Engineered with advanced parallel balance charge-discharge technology, it instantly transforms your batteries into a portable power bank, keeping your phone and essential gear running wherever you go.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 40px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PD21700_1.jpg?v=1688477015\" alt=\"SPERAS PD21700 2-in-1 smart battery charger and power bank main profile\" style=\"max-width: 100%; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.05);\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003ch2 style=\"font-size: 28px; font-weight: bold; color: #111; margin-bottom: 20px; text-align: center;\"\u003eWhy the PD21700 Outperforms the Competition\u003c\/h2\u003e\n\u003cp style=\"text-align: center; font-size: 16px; color: #555; max-width: 700px; margin: 0 auto 30px auto;\"\u003eMost chargers do one thing. The PD21700 works twice as hard, bridging the gap between tactical gear maintenance and everyday digital survival.\u003c\/p\u003e\n\u003cdiv class=\"speras-table-wrapper\"\u003e\n\u003ctable class=\"speras-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth style=\"background-color: #334155;\"\u003eStandard Chargers\u003c\/th\u003e\n\u003cth style=\"background-color: #ea580c;\"\u003e🔥 SPERAS PD21700\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFunctionality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003eCharger Only\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003e2-in-1: Charger + Power Bank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSlot Control\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003eShared Current\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003eIndependent Detection \u0026amp; Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Health Tech\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003eBasic Trickle\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003eTC\/CC\/CV 3-Stage Charging\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConversion Efficiency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"highlight-standard\"\u003e~70% - 80%\u003c\/td\u003e\n\u003ctd class=\"highlight-brand\"\u003eUp to 90% Efficiency\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 50px;\"\u003e\n\u003ch2 style=\"font-size: 28px; font-weight: bold; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 30px; text-align: center;\"\u003eCore Professional Features\u003c\/h2\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; margin-bottom: 40px; background: #fafafa; border-radius: 8px; overflow: hidden; border: 1px solid #f0f0f0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 30px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ff4500; margin-top: 0;\"\u003eMore Than a Charger: It's a Power Bank\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 0;\"\u003eEquipped with innovative \u003cstrong\u003eparallel balance charge-discharge technology\u003c\/strong\u003e, the PD21700 allows you to reverse the flow. Insert your charged 21700 or 18650 batteries, plug in your USB cable, and instantly use it as a high-capacity power bank to charge your \u003cstrong\u003esmartphone\u003c\/strong\u003e, GPS, or other USB devices in an emergency.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PD21700_2.jpg?v=1688477033\" alt=\"SPERAS PD21700 functioning as a portable power bank to charge mobile devices via USB\" style=\"width: 100%; height: 100%; object-fit: cover; display: block;\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; margin-bottom: 40px; background: #fafafa; border-radius: 8px; overflow: hidden; flex-direction: row-reverse; border: 1px solid #f0f0f0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 30px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ff4500; margin-top: 0;\"\u003eIndependent Dual-Slot Smart Control\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 0;\"\u003eCapable of charging two batteries simultaneously without interference. The built-in microcomputer independently controls each slot, automatically detecting the battery's voltage. Intuitive \u003cstrong\u003eLED indicators\u003c\/strong\u003e clearly display the real-time charging status so you are never left guessing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PD21700_3.jpg?v=1688477050\" alt=\"Independent dual-slot charging technology for 21700 and 18650 batteries with LED indicators\" style=\"width: 100%; height: 100%; object-fit: cover; display: block;\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; margin-bottom: 40px; background: #fafafa; border-radius: 8px; overflow: hidden; border: 1px solid #f0f0f0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 30px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ff4500; margin-top: 0;\"\u003eTC\/CC\/CV 3-Stage Charging\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 0;\"\u003eWe protect your investment. The PD21700 utilizes advanced TC (Trickle Current), CC (Constant Current), and CV (Constant Voltage) three-stage charging to maximize your battery's lifespan. It achieves a \u003cstrong\u003epower conversion efficiency of up to 90%\u003c\/strong\u003e and precisely cuts off at exactly 4.2V when fully charged to prevent degradation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PD21700_5.jpg?v=1688477065\" alt=\"SPERAS battery charger illustrating high conversion efficiency and TC CC CV 3-stage charging\" style=\"width: 100%; height: 100%; object-fit: cover; display: block;\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; margin-bottom: 40px; background: #fafafa; border-radius: 8px; overflow: hidden; flex-direction: row-reverse; border: 1px solid #f0f0f0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 30px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ff4500; margin-top: 0;\"\u003eMulti-Layer Defense System\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 0;\"\u003eSafety is never an option; it's a standard. The charger features comprehensive protections including \u003cstrong\u003eReverse-Polarity, Short Circuit, Overcharge, and Overheat protection\u003c\/strong\u003e. Furthermore, the entire chassis is constructed from high-grade \u003cstrong\u003eflame-retardant material\u003c\/strong\u003e for ultimate peace of mind.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PD21700_6.jpg?v=1688477085\" alt=\"SPERAS charger multi-layer safety protection system including flame retardant materials\" style=\"width: 100%; height: 100%; object-fit: cover; display: block;\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 50px;\"\u003e\n\u003ch2\u003e\n\u003cspan dir=\"auto\"\u003ePD21700 \u003c\/span\u003eDesign \u0026amp; Dimensions\u003c\/h2\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PD21700_7.jpg?v=1688477099\" alt=\"Compact dimensions of the PD21700 charger: 110x48.4x28.9mm\" style=\"width: 100%; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.05);\" class=\"speras-zoom\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PD21700-_8.jpg?v=1688477114\" alt=\"SPERAS PD21700 packaging and included charging accessories\" style=\"width: 100%; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.05);\" class=\"speras-zoom\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f8f9fa; color: #333; padding: 35px; border-radius: 8px; margin-bottom: 50px; border-left: 6px solid #ea580c; border-top: 1px solid #eee; border-right: 1px solid #eee; border-bottom: 1px solid #eee;\"\u003e\n\u003ch2 style=\"font-size: 26px; font-weight: bold; color: #111; margin-top: 0; margin-bottom: 20px;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.8; padding-left: 20px; margin-bottom: 0; color: #444;\"\u003e\n\u003cli style=\"margin-bottom: 12px;\"\u003e\n\u003cstrong\u003eCompatible Batteries:\u003c\/strong\u003e 21700 and 18650 Li-ion batteries\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 12px;\"\u003e\n\u003cstrong\u003eUSB Input:\u003c\/strong\u003e 5V\/2A\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 12px;\"\u003e\n\u003cstrong\u003eDC Output:\u003c\/strong\u003e DC 4.2V \/ 1A * 2 slots OR 2A * 1 slot\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 12px;\"\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 110mm (L) * 48.4mm (W) * 28.9mm (H)\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 12px;\"\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 76.9g (net weight) \/ 146g (gross weight)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff; border: 1px solid #e0e0e0; padding: 25px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.02); margin-bottom: 50px;\"\u003e\n\u003ch3 style=\"font-size: 20px; font-weight: bold; margin-top: 0; color: #111;\"\u003e📦 What’s in the Box:\u003c\/h3\u003e\n\u003cul style=\"line-height: 1.8; color: #555; margin-top: 15px;\"\u003e\n\u003cli\u003e1 × SPERAS PD21700 Smart Charger\u003c\/li\u003e\n\u003cli\u003e1 × USB Charging Cable\u003c\/li\u003e\n\u003cli\u003e1 × User Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 26px; font-weight: bold; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 30px;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 50px;\"\u003e\n\u003cdetails style=\"background: #fff; padding: 15px 20px; margin-bottom: 10px; border-radius: 6px; border: 1px solid #ddd; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.02);\" open=\"\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #222; outline: none;\"\u003eHow exactly does the Power Bank feature work?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 15px; font-size: 16px; color: #555; line-height: 1.6;\"\u003eOnce you have charged 18650 or 21700 batteries inserted into the PD21700, you can plug your standard USB charging cable into the output port and connect it to your phone, tablet, or GPS. The parallel balance discharge tech will safely draw power from your batteries to charge your digital devices, making it perfect for emergencies and camping.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #fff; padding: 15px 20px; margin-bottom: 10px; border-radius: 6px; border: 1px solid #ddd; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.02);\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #222; outline: none;\"\u003eCan I charge one 21700 and one 18650 at the same time?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 15px; font-size: 16px; color: #555; line-height: 1.6;\"\u003eYes! The PD21700 features independent slot control. The built-in microcomputer will automatically detect the voltage and manage the optimal charging current for each battery separately, ensuring safe and efficient charging even with mixed battery sizes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #fff; padding: 15px 20px; margin-bottom: 10px; border-radius: 6px; border: 1px solid #ddd; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.02);\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #222; outline: none;\"\u003eIs it safe to leave my batteries on the charger overnight?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 15px; font-size: 16px; color: #555; line-height: 1.6;\"\u003eAbsolutely. The charger utilizes a smart TC\/CC\/CV 3-stage process and will automatically and precisely cut off power once the battery hits 4.2V. Coupled with overcharge, overheat, and reverse-polarity protections, as well as a flame-retardant body, it is completely safe for unattended charging.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n {\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"FAQPage\",\n \"mainEntity\": [{\n \"@type\": \"Question\",\n \"name\": \"How exactly does the Power Bank feature work?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"Once you have charged 18650 or 21700 batteries inserted into the PD21700, you can plug your standard USB charging cable into the output port and connect it to your phone, tablet, or GPS. The parallel balance discharge tech will safely draw power from your batteries to charge your digital devices, making it perfect for emergencies and camping.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"Can I charge one 21700 and one 18650 at the same time?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"Yes! The PD21700 features independent slot control. The built-in microcomputer will automatically detect the voltage and manage the optimal charging current for each battery separately, ensuring safe and efficient charging even with mixed battery sizes.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"Is it safe to leave my batteries on the charger overnight?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"Absolutely. The charger utilizes a smart TC\/CC\/CV 3-stage process and will automatically and precisely cut off power once the battery hits 4.2V. Coupled with overcharge, overheat, and reverse-polarity protections, as well as a flame-retardant body, it is completely safe for unattended charging.\"\n }\n }]\n }\n\u003c\/script\u003e \u003cdiv id=\"speras-lightbox\"\u003e\u003cimg id=\"speras-lightbox-img\" alt=\"Enlarged view of SPERAS PD21700 charger\"\u003e\u003c\/div\u003e\n\u003cscript\u003e\n document.addEventListener(\"DOMContentLoaded\", function() {\n var lightbox = document.getElementById('speras-lightbox');\n var lightboxImg = document.getElementById('speras-lightbox-img');\n var images = document.querySelectorAll('.speras-zoom');\n\n if (lightbox \u0026\u0026 lightboxImg) {\n images.forEach(function(img) {\n img.addEventListener('click', function(e) {\n e.preventDefault();\n lightboxImg.src = this.src;\n lightbox.classList.add('active');\n document.body.style.overflow = 'hidden';\n });\n });\n\n lightbox.addEventListener('click', function() {\n lightbox.classList.remove('active');\n document.body.style.overflow = '';\n setTimeout(function() {\n lightboxImg.src = '';\n }, 300);\n });\n }\n });\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SPERAS","offers":[{"title":"Default Title","offer_id":42784802865329,"sku":"PD21700","price":35.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PD21700-1000X1000.jpg?v=1688477305"},{"product_id":"speras-s10t-10000mah-21700-battery-pack","title":"SPERAS S10T 10000mAh 21700 battery Pack","description":"\u003cstyle\u003e\n \/* SPERAS 配件详情页基础样式 *\/\n .speras-battery-container { font-family: 'Inter', -apple-system, BlinkMacSystemFont, Arial, sans-serif; color: #1e293b; line-height: 1.8; max-width: 800px; margin: 0 auto; padding: 20px; background: #fff; }\n \n .speras-battery-container h2 { font-size: 28px; color: #0f172a; margin-bottom: 20px; border-left: 5px solid #ea580c; padding-left: 15px; font-weight: 800; text-transform: uppercase; }\n .speras-battery-container p { font-size: 18px; color: #475569; margin-bottom: 25px; }\n \n .battery-feature-box { background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 12px; padding: 30px; margin: 30px 0; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); }\n .battery-feature-box ul { list-style: none; padding-left: 0; margin: 0; }\n .battery-feature-box li { font-size: 18px; color: #334155; margin-bottom: 15px; padding-left: 30px; position: relative; }\n .battery-feature-box li::before { content: \"⚡\"; position: absolute; left: 0; top: 0; color: #ea580c; }\n \n .battery-image-wrapper { text-align: center; margin: 40px 0; }\n .battery-image-wrapper img { max-width: 100%; height: auto; border-radius: 12px; box-shadow: 0 10px 25px rgba(0,0,0,0.08); }\n\n \/* ========================================================= *\/\n \/* 📱 移动端防重叠修复补丁 (终极修复标题和列表行高压扁 Bug) *\/\n \/* ========================================================= *\/\n @media screen and (max-width: 850px) {\n .speras-battery-container { padding: 15px !important; box-sizing: border-box !important; overflow: hidden !important; }\n .battery-feature-box { padding: 20px 15px !important; }\n \n \/* 彻底释放文字换行，消除文字溢出和不换行 *\/\n .speras-battery-container h2, \n .speras-battery-container h3, \n .speras-battery-container p, \n .speras-battery-container span, \n .speras-battery-container li,\n .speras-battery-container a {\n white-space: normal !important;\n word-wrap: break-word !important;\n word-break: break-word !important;\n overflow-wrap: break-word !important; \n height: auto !important;\n max-height: none !important;\n }\n \n \/* 🚨 核心修复：强制重写小标题和列表行高，彻底拉开行距！ *\/\n .speras-battery-container h2 { line-height: 1.4 !important; font-size: 24px !important; margin-bottom: 15px !important; }\n .speras-battery-container h3 { line-height: 1.4 !important; font-size: 20px !important; margin-bottom: 15px !important; }\n .speras-battery-container p, \n .speras-battery-container li { line-height: 1.6 !important; font-size: 16px !important; }\n\n \/* 防止图片撑破屏幕 *\/\n .speras-battery-container img { max-width: 100% !important; height: auto !important; margin: 0 auto !important; display: block !important; }\n }\n\u003c\/style\u003e\n\u003cdiv class=\"speras-battery-container\"\u003e\n\u003ch2\u003ePower Your Mission: SPERAS S10T Battery Pack\u003c\/h2\u003e\n\u003cp\u003eDon't let your flashlight fade when you need it most. The \u003cstrong\u003eSPERAS S10T\u003c\/strong\u003e is a premium, heavy-duty lithium-ion battery pack engineered specifically for high-performance hunting and search-and-rescue flashlights.\u003c\/p\u003e\n\u003cp\u003eBuilt with uncompromising quality, the S10T is constructed using \u003cstrong\u003etwo \u003ca href=\"https:\/\/sperasflashlight.com\/products\/speras-s50-21700-5000mah-battery\" target=\"_blank\" title=\"SPERAS S50 21700 5000mAh Battery\" rel=\"noopener\"\u003e5000mAh\u003c\/a\u003e 21700 cells configured in series\u003c\/strong\u003e. This innovative design delivers the high voltage required by extreme-output LEDs, while providing a massive \u003cstrong\u003e10000mAh total capacity\u003c\/strong\u003e for ultra-long runtimes in the field.\u003c\/p\u003e\n\u003cdiv class=\"battery-image-wrapper\"\u003e\u003cimg alt=\"SPERAS S10T 10000mAh 21700 Lithium-ion Battery Pack with LG Cells\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/S10T.jpg?v=1702042752\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"battery-feature-box\"\u003e\n\u003ch3 style=\"margin-top: 0; color: #0f172a; font-size: 22px; margin-bottom: 20px;\"\u003eCore Specifications \u0026amp; Advantages\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium LG Cells Inside:\u003c\/strong\u003e Manufactured exclusively with high-quality LG lithium-ion cells, guaranteeing industry-leading safety, stable discharge rates, and a significantly longer lifespan than generic batteries.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMassive 10000mAh Capacity:\u003c\/strong\u003e Say goodbye to battery anxiety. The dual 5000mAh configuration ensures your gear stays illuminated through the longest nights.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries Configuration for High Power:\u003c\/strong\u003e Expertly welded in series to provide the sustained high-voltage current needed for heavy-duty tactical and search flashlights.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable \u0026amp; Safe:\u003c\/strong\u003e Designed to withstand the rigorous demands of professional outdoor use, ensuring consistent power delivery in harsh environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 16px; color: #64748b; font-style: italic;\"\u003e* Note: This battery pack is specifically designed for compatible SPERAS high-output flashlights (such as the\u003ca href=\"https:\/\/sperasflashlight.com\/products\/speras-t217-v3-hunting-flashlight-3000-lumen-flashlight\" target=\"_blank\" title=\"SPERAS T217 V3 21700 Battery Hunting Flashlight 3000lm 1500m Search Flashlights\" rel=\"noopener\"\u003e \u003cstrong\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eT217 V3\u003c\/span\u003e\u003c\/strong\u003e\u003c\/a\u003e series). Please verify your flashlight's battery requirements before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SPERAS","offers":[{"title":"Default Title","offer_id":43146249699505,"sku":"S10T","price":46.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/ST10-Battery.jpg?v=1724934768"},{"product_id":"speras-lth45-21700-lithium-batter-cold-weather-battery-flashlight-battery","title":"SPERAS LTH45 4500mAh 21700 Low Temperature Lithium Battery","description":"\u003cstyle\u003e\n \/* 🏆 Speras Universal Hero Banner \u0026 Layout Style *\/\n .speras-pdp-container { font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif; color: #333; line-height: 1.6; max-width: 950px; margin: 0 auto; padding: 20px; box-sizing: border-box; }\n .speras-hero-banner { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); padding: 50px 30px; border-radius: 20px; margin-bottom: 40px; text-align: center; border-bottom: 6px solid #ea580c; 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}\n\n \/* Lightbox and Hover Effects (替换为安全居中版，防止手机端图片置顶) *\/\n .speras-zoom { cursor: zoom-in; transition: transform 0.2s; display: block; }\n .speras-zoom:hover { transform: scale(1.02); }\n #speras-lightbox { position: fixed; z-index: 999999; top: 0; left: 0; right: 0; bottom: 0; background: rgba(15, 23, 42, 0.95); display: flex; justify-content: center; align-items: center; opacity: 0; visibility: hidden; transition: opacity 0.3s ease; cursor: zoom-out; padding: 15px; box-sizing: border-box; }\n #speras-lightbox.active { opacity: 1; visibility: visible; }\n #speras-lightbox img { max-width: 100%; max-height: 100%; object-fit: contain; border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,0.5); transform: scale(0.9); transition: transform 0.3s ease; }\n #speras-lightbox.active img { transform: scale(1); }\n\n \/* Layout Elements *\/\n .speras-section-title { font-size: 28px; font-weight: bold; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-top: 50px; margin-bottom: 30px; text-align: center; }\n\n \/* ========================================================= *\/\n \/* 📱 移动端防重叠修复补丁 (纯 CSS 拦截) *\/\n \/* ========================================================= *\/\n @media screen and (max-width: 850px) {\n .speras-pdp-container { padding: 10px !important; overflow: hidden !important; box-sizing: border-box !important; }\n .speras-pdp-container .speras-hero-banner { padding: 30px 15px !important; height: auto !important; }\n \n \/* 强制打散所有横向排版的左右图文模块，变更为上下单列 *\/\n .speras-pdp-container div[style*=\"display: flex\"] { display: block !important; }\n .speras-pdp-container div[style*=\"flex: 1\"] { \n display: block !important; \n width: 100% !important; \n max-width: 100% !important; \n margin-bottom: 20px !important; \n padding: 15px !important; \n height: auto !important; \n box-sizing: border-box !important; \n }\n\n \/* 强制释放所有文本元素，消灭文字重叠和不换行现象 *\/\n .speras-pdp-container h1, .speras-pdp-container h2, .speras-pdp-container h3, \n .speras-pdp-container p, .speras-pdp-container span, .speras-pdp-container li,\n .speras-pdp-container summary, .speras-pdp-container table, .speras-pdp-container th, .speras-pdp-container td {\n white-space: normal !important;\n word-wrap: break-word !important;\n word-break: break-word !important;\n overflow-wrap: anywhere !important; \n line-height: 1.5 !important;\n height: auto !important;\n max-height: none !important;\n }\n \n .speras-pdp-container h1 { font-size: 24px !important; line-height: 1.4 !important; margin-bottom: 15px !important; }\n .speras-pdp-container .speras-section-title { font-size: 22px !important; line-height: 1.4 !important; margin-top: 30px !important; margin-bottom: 20px !important; }\n .speras-pdp-container img { max-width: 100% !important; height: auto !important; }\n }\n\u003c\/style\u003e\n\u003cdiv class=\"speras-pdp-container\"\u003e\n\u003cdiv class=\"speras-hero-banner\"\u003e\n\u003cspan style=\"display: inline-block; background: #ea580c; color: #fff; padding: 6px 18px; border-radius: 30px; font-size: 14px; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 15px;\"\u003eExtreme Environment Power Cell\u003c\/span\u003e\n\u003ch1\u003eSPERAS LTH45 21700 Battery – 4500mAh Cold Resistant Power\u003c\/h1\u003e\n\u003cp class=\"subtitle\"\u003e🔋 Designed for extreme environments, the \u003cspan style=\"color: #ea580c; font-weight: bold;\"\u003eSPERAS LTH45 Lithium Battery\u003c\/span\u003e delivers reliable performance even in freezing conditions. Compared to standard \u003cstrong\u003e21700 lithium batteries\u003c\/strong\u003e, it performs up to \u003cstrong\u003e3× better at \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e-40°C\/°F\u003c\/span\u003e\u003c\/strong\u003e, making it an ideal power solution for outdoor gear, tactical flashlights, and harsh-weather applications.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; justify-content: center; gap: 15px; flex-wrap: wrap; margin-top: 15px;\"\u003e\n\u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e❄️ Rated to -40°C\u003c\/span\u003e \u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e🔋 4500mAh Capacity\u003c\/span\u003e \u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e🔌 Integrated USB-C\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"speras-section-title\"\u003eWhy Choose SPERAS LTH45?\u003c\/h2\u003e\n\u003cdiv style=\"background: #fafafa; padding: 30px; border-radius: 12px; border: 1px solid #e2e8f0; margin-bottom: 50px;\"\u003e\n\u003cul style=\"font-size: 17px; color: #475569; padding-left: 20px; line-height: 2.2; margin-bottom: 0; font-weight: 500;\"\u003e\n\u003cli\u003e❄️ Outstanding performance in extreme cold (-40°C \/ -40°F)\u003c\/li\u003e\n\u003cli\u003e🔋 High-capacity 4500mAh for longer runtime\u003c\/li\u003e\n\u003cli\u003e⚡ Stable output for high-drain devices (10A Max)\u003c\/li\u003e\n\u003cli\u003e🔌 Convenient direct USB-C charging support\u003c\/li\u003e\n\u003cli\u003e🛠️ Reliable SPERAS quality and safety standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; margin-bottom: 40px; background: #fafafa; border-radius: 8px; overflow: hidden; border: 1px solid #f0f0f0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 30px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ea580c; margin-top: 0;\"\u003eDefeat the Freeze: Rated to -40°C\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 15px;\"\u003eStandard lithium batteries fail quickly when the temperature drops. The SPERAS LTH45 is specifically engineered for low-temperature environments, performing reliably where other power cells shut down.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 0;\"\u003eAs shown in the performance data, LTH45 delivers stable voltage and runtime even at \u003cstrong\u003e-40°C (-40°F)\u003c\/strong\u003e, ensuring your tactical lights and outdoor gear stay running when you need them most.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 20px;\"\u003e\u003cimg style=\"width: 100%; border-radius: 8px; display: block; margin: 0 auto;\" alt=\"21700 battery cold weather performance graph SPERAS LTH45 vs standard battery at -40C\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/SPERAS_LTH45_4500mAh_21700_Low_Temperature_Lithium_Battery-2_600x600.jpg?v=1770101840\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; margin-bottom: 40px; background: #fafafa; border-radius: 8px; overflow: hidden; flex-direction: row-reverse; border: 1px solid #f0f0f0;\"\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 30px;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ea580c; margin-top: 0;\"\u003e4500mAh Capacity \u0026amp; Integrated USB-C Charging\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 15px;\"\u003eWith a robust \u003cstrong\u003e4500mAh capacity\u003c\/strong\u003e, this battery provides stable energy output (5A Continuous \/ 10A Max) for high-performance flashlights and devices that demand reliable energy in harsh conditions.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; margin-bottom: 0;\"\u003e🔋 The innovative integrated \u003cstrong\u003eUSB-C charging port\u003c\/strong\u003e eliminates the need for a separate charger, offering a convenient and efficient recharging method wherever power is available.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 300px; padding: 20px;\"\u003e\u003cimg style=\"width: 100%; border-radius: 8px; display: block; margin: 0 auto;\" alt=\"SPERAS LTH45 4500mAh 21700 battery wrap showcasing integrated USB-C charging port\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/SPERAS_LTH45_4500mAh_21700_Low_Temperature_Lithium_Battery-1_600x600.jpg?v=1770101828\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"speras-section-title\"\u003eEngineered Specifications: Technical Details\u003c\/h2\u003e\n\u003cdiv class=\"speras-table-wrapper\"\u003e\n\u003ctable class=\"speras-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSPERAS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eModel\u003c\/td\u003e\n\u003ctd\u003eLTH45\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eBattery Type\u003c\/td\u003e\n\u003ctd\u003e21700 Lithium Battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e4500mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e3.6V (Power: 12.6Wh)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eCharging\u003c\/td\u003e\n\u003ctd\u003eUSB-C (1A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eContinuous Output\u003c\/td\u003e\n\u003ctd\u003e5A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eMax Output\u003c\/td\u003e\n\u003ctd\u003e10A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eWorking Temperature\u003c\/td\u003e\n\u003ctd\u003e-40°C to 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1 Year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eLength\u003c\/td\u003e\n\u003ctd\u003e75mm (+0.3~0.5mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e21.4mm (+0.1~0.15mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e71.1g (Gross: 78.8g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff; padding: 40px 20px; border: 2px solid #ea580c; border-radius: 12px; text-align: center; margin: 50px 0; box-shadow: 0 10px 25px rgba(234, 88, 12, 0.08);\"\u003e\n\u003ch2 style=\"font-size: 28px; color: #0f172a; margin-top: 0; margin-bottom: 15px; font-weight: 900;\"\u003eEquip Your Extreme Gear\u003c\/h2\u003e\n\u003cp style=\"font-size: 16px; color: #475569; margin-bottom: 25px; max-width: 650px; margin-left: auto; margin-right: auto;\"\u003esettle for standard power cells that fail in the cold. Upgrade to the SPERAS LTH45 and experience 3× better performance at -40°C with integrated USB-C convenience.\u003c\/p\u003e\n\u003ca style=\"display: inline-block; background: #ea580c; color: #fff; padding: 16px 40px; border-radius: 8px; font-weight: 900; font-size: 18px; text-transform: uppercase; box-shadow: 0 6px 20px rgba(234, 88, 12, 0.35); text-decoration: none; transition: background 0.3s ease;\" href=\"#top\"\u003e🛒 Select Options \u0026amp; Add To Cart\u003c\/a\u003e\n\u003cp style=\"font-size: 14px; color: #64748b; margin-top: 15px; font-weight: bold;\"\u003eSecure Checkout | Speras Official Warranty\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"speras-section-title\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 40px;\"\u003e\n\u003cdetails open=\"\" style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 15px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #0f172a; outline: none;\"\u003eCan this lithium battery be used in extreme cold weather?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eYes, the SPERAS LTH45 is specifically designed for low-temperature environments and performs reliably even at -40°C \/ -40°F.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\" style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 15px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #0f172a; outline: none;\"\u003eIs this battery compatible with all 21700 devices?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eIt is compatible with most devices that support standard 21700 lithium batteries. However, it is a protected, long-cell (75mm), so always check your device's physical space and voltage specifications before use.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 15px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #0f172a; outline: none;\"\u003eDoes the battery support direct USB-C charging?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eYes, the battery supports direct USB-C charging via the built-in port for convenient and efficient recharging.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\" style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 15px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #0f172a; outline: none;\"\u003eWhat devices is this battery best suited for?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eThis battery is ideal for high-performance tactical flashlights, outdoor gear used by hikers and mountaineers, and any high-drain devices used in cold environments.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\" style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 15px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; color: #0f172a; outline: none;\"\u003eIs it safe for high-drain applications?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eYes, with a maximum output of 10A and a stable voltage curve, it is suitable for high-current devices requiring dependable performance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n    {\n      \"@context\": \"https:\/\/schema.org\",\n      \"@type\": \"FAQPage\",\n      \"mainEntity\": [{\n        \"@type\": \"Question\",\n        \"name\": \"Can this lithium battery be used in extreme cold weather?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Yes, the SPERAS LTH45 is specifically designed for low-temperature environments and performs reliably even at -40°C \/ -40°F.\"\n        }\n      },{\n        \"@type\": \"Question\",\n        \"name\": \"Is this battery compatible with all 21700 devices?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"It is compatible with most devices that support standard 21700 lithium batteries. However, it is a protected, long-cell (75mm), so always check your device specifications before use.\"\n        }\n      },{\n        \"@type\": \"Question\",\n        \"name\": \"Does the battery support direct USB-C charging?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Yes, the battery supports USB-C charging for convenient and efficient recharging.\"\n        }\n      },{\n        \"@type\": \"Question\",\n        \"name\": \"What devices is this battery best suited for?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"This battery is ideal for high-performance tactical flashlights, outdoor gear, and any devices used in cold environments.\"\n        }\n      },{\n        \"@type\": \"Question\",\n        \"name\": \"Is it safe for high-drain applications?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Yes, with a maximum output of 10A, it is suitable for high-current devices requiring stable performance.\"\n        }\n      }]\n    }\n\u003c\/script\u003e\n\u003cdiv id=\"speras-lightbox\"\u003e\u003cimg alt=\"Enlarged product image\" id=\"speras-lightbox-img\"\u003e\u003c\/div\u003e\n\u003cscript\u003e\n    document.addEventListener(\"DOMContentLoaded\", function() {\n        var lightbox = document.getElementById('speras-lightbox');\n        var lightboxImg = document.getElementById('speras-lightbox-img');\n        var images = document.querySelectorAll('.speras-zoom');\n\n        if (lightbox \u0026\u0026 lightboxImg) {\n            images.forEach(function(img) {\n                img.addEventListener('click', function(e) {\n                    e.preventDefault();\n                    lightboxImg.src = this.src;\n                    lightbox.classList.add('active');\n                    document.body.style.overflow = 'hidden';\n                });\n            });\n\n            lightbox.addEventListener('click', function() {\n                lightbox.classList.remove('active');\n                document.body.style.overflow = '';\n                setTimeout(function() {\n                    lightboxImg.src = '';\n                }, 300);\n            });\n        }\n    });\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"SPERAS","offers":[{"title":"Black \/ SPERAS LTH45","offer_id":46633093922993,"sku":null,"price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/SPERASLTH454500mAh21700LowTemperatureLithiumBattery-1.jpg?v=1770101850"},{"product_id":"speras-pb50-21700-battery-5000mah-battery-high-drain-battery-lithium-ion-battery-flashlight-battery","title":"SPERAS PB50 5000mAh 21700 Tabless Rechargeable Lithium Battery","description":"\u003cstyle\u003e\n \/* 🏆 Speras Universal Hero Banner \u0026 Layout Style *\/\n .speras-pdp-container { font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif; color: #333; line-height: 1.6; max-width: 950px; margin: 0 auto; padding: 20px; }\n .speras-hero-banner { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); padding: 50px 30px; border-radius: 20px; margin-bottom: 40px; text-align: center; border-bottom: 6px solid #ea580c; box-shadow: 0 10px 25px rgba(0,0,0,0.15); }\n .speras-hero-banner h1 { font-size: 38px; font-weight: 900; color: #ffffff !important; margin: 0 0 15px 0; line-height: 1.3; }\n .speras-hero-banner .subtitle { font-size: 18px; max-width: 850px; margin: 0 auto 20px auto; color: #cbd5e1 !important; line-height: 1.7; }\n \n \/* Comparison Table \/ Formatting *\/\n .speras-table-wrapper { overflow-x: auto; margin: 40px 0; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); border: 1px solid #e2e8f0; }\n .speras-table { width: 100%; border-collapse: collapse; text-align: left; background-color: #fff; min-width: 600px; }\n .speras-table th, .speras-table td { padding: 16px 20px; border-bottom: 1px solid #e2e8f0; font-size: 16px; color: #444; }\n .speras-table th { background-color: #0f172a; font-weight: bold; color: #fff; font-size: 16px; }\n .speras-table tr:hover { background-color: #f9fafb; }\n .speras-highlight-col { background-color: #fafafa; font-weight: bold; width: 40%; color: #111 !important; }\n\n \/* Lightbox and Hover Effects *\/\n .speras-zoom { cursor: zoom-in; transition: transform 0.2s; display: block; }\n .speras-zoom:hover { transform: scale(1.02); }\n #speras-lightbox { position: fixed; z-index: 999999; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(15, 23, 42, 0.95); display: flex; justify-content: center; align-items: center; opacity: 0; visibility: hidden; transition: opacity 0.3s ease; cursor: zoom-out; }\n #speras-lightbox.active { opacity: 1; visibility: visible; }\n #speras-lightbox img { max-width: 90vw; max-height: 90vh; border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,0.5); transform: scale(0.9); transition: transform 0.3s ease; }\n #speras-lightbox.active img { transform: scale(1); }\n\n \/* Layout Elements *\/\n .speras-section-title { font-size: 28px; font-weight: bold; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-top: 50px; margin-bottom: 30px; text-align: center; }\n .speras-grid-2 { display: flex; flex-wrap: wrap; gap: 30px; margin-bottom: 40px; }\n .speras-grid-2 \u003e div { flex: 1 1 300px; }\n\n \/* ========================================================= *\/\n \/* 📱 移动端万能防重叠修复补丁 *\/\n \/* ========================================================= *\/\n @media screen and (max-width: 850px) {\n .speras-pdp-container .speras-grid-2 {\n display: block !important; \n }\n .speras-pdp-container .speras-grid-2 \u003e div {\n display: block !important;\n width: 100% !important;\n max-width: 100% !important;\n margin-bottom: 20px !important;\n box-sizing: border-box !important;\n }\n\n \/* 强制重置行高与断行，彻底消灭手机端文字错乱与叠罗汉 *\/\n .speras-pdp-container h1, \n .speras-pdp-container h2, \n .speras-pdp-container h3, \n .speras-pdp-container p, \n .speras-pdp-container span, \n .speras-pdp-container li,\n .speras-pdp-container summary {\n white-space: normal !important;\n word-wrap: break-word !important;\n word-break: break-word !important;\n line-height: 1.5 !important;\n height: auto !important;\n }\n \n .speras-pdp-container .speras-hero-banner h1 {\n font-size: 26px !important;\n line-height: 1.3 !important;\n }\n \n .speras-pdp-container .speras-section-title {\n font-size: 22px !important;\n line-height: 1.4 !important;\n margin-top: 30px !important;\n }\n }\n\u003c\/style\u003e\n\n\u003cdiv class=\"speras-pdp-container\"\u003e\n\u003cdiv class=\"speras-hero-banner\"\u003e\n\u003cspan style=\"display: inline-block; background: #ea580c; color: #fff; padding: 6px 18px; border-radius: 30px; font-size: 14px; font-weight: 800; text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 20px;\"\u003eHigh-Drain Power Source\u003c\/span\u003e\n\u003ch1\u003eSPERAS PB50: 21700 5000mAh Lithium-ion Battery\u003c\/h1\u003e\n\u003cp class=\"subtitle\"\u003eThe \u003cstrong style=\"color: #ea580c;\"\u003eSPERAS PB50 21700 lithium battery\u003c\/strong\u003e 🔋 is designed for high-performance use, offering a perfect balance of power, safety, and durability. With a capacity of \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e5000mAh\u003c\/strong\u003e\u003c\/span\u003e and a stable \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e3.6V\u003c\/strong\u003e\u003c\/span\u003e output, it delivers consistent energy for high-lumen flashlights and other high-drain devices.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; justify-content: center; gap: 15px; flex-wrap: wrap; margin-top: 15px;\"\u003e\n\u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e🔋 5000mAh Capacity\u003c\/span\u003e \u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e⚡ 40A Max Discharge\u003c\/span\u003e \u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e⚙️ Tabless Design\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"text-align: center; margin-bottom: 50px;\"\u003e\u003cimg style=\"max-width: 600px; width: 100%; height: auto; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); margin: 0 auto; display: block;\" alt=\"SPERAS PB50 5000mAh 21700 high-drain rechargeable lithium-ion battery\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PB50-1.jpg?v=1770834605\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\n\u003ch2 class=\"speras-section-title\"\u003eEngineered for Extreme Performance\u003c\/h2\u003e\n\u003cdiv class=\"speras-grid-2\"\u003e\n\u003cdiv style=\"background: #fafafa; padding: 30px; border-radius: 8px; border: 1px solid #f0f0f0;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ea580c; margin-top: 0; margin-bottom: 20px;\"\u003eAdvanced Tabless Design \u0026amp; Safety\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; color: #555; margin-bottom: 15px;\"\u003eBuilt with a \u003cstrong\u003etabless design\u003c\/strong\u003e ⚙️, the SPERAS PB50 battery significantly improves energy efficiency and helps reduce heat during intensive use. It also includes built-in protection against overcharge and over-discharge, supporting safer operation and a longer battery life cycle.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; color: #555; margin-bottom: 0;\"\u003eThe solid outer construction adds excellent impact resistance, making it suitable for both daily use and harsh outdoor conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff; padding: 30px; border-radius: 8px; border: 1px solid #e0e0e0; box-shadow: 0 2px 10px rgba(0,0,0,0.02);\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #111; margin-top: 0; margin-bottom: 20px;\"\u003eKey Specifications\u003c\/h3\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.8; color: #444; list-style: none; padding: 0; margin: 0;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e🏷️ \u003cstrong\u003eBrand \/ Model:\u003c\/strong\u003e SPERAS PB50\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e🔋 \u003cstrong\u003eMassive Capacity:\u003c\/strong\u003e 5000mAh\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e⚡ \u003cstrong\u003eStable Voltage:\u003c\/strong\u003e 3.6V\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e🚀 \u003cstrong\u003eHigh-Drain Output:\u003c\/strong\u003e 40A Max Continuous Discharge Current\u003c\/li\u003e\n\u003cli\u003e🛡️ \u003cstrong\u003eWarranty:\u003c\/strong\u003e 1 year (contact us for support or replacement if needed)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 20px; justify-content: center; margin-bottom: 50px;\"\u003e\n\u003cimg style=\"flex: 1 1 300px; width: 100%; max-width: 48%; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); object-fit: cover;\" alt=\"SPERAS PB50 21700 battery highlighting 5000mAh capacity and 3.6V output\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PB50-2.jpg?v=1770834604\" class=\"speras-zoom\"\u003e \u003cimg style=\"flex: 1 1 300px; width: 100%; max-width: 48%; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); object-fit: cover;\" alt=\"SPERAS PB50 tabless design battery showcasing 40A max continuous discharge current\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PB50-3.jpg?v=1770834605\" class=\"speras-zoom\"\u003e\n\u003c\/div\u003e\n\n\u003ch2 class=\"speras-section-title\"\u003eTechnical Details\u003c\/h2\u003e\n\u003cdiv class=\"speras-table-wrapper\"\u003e\n\u003ctable class=\"speras-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eModel\u003c\/td\u003e\n\u003ctd\u003ePB50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eBattery Type\u003c\/td\u003e\n\u003ctd\u003e21700 3.6V Lithium Battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eBattery Capacity\u003c\/td\u003e\n\u003ctd\u003e5000 mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eBattery Voltage\u003c\/td\u003e\n\u003ctd\u003e3.6 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eEnergy\u003c\/td\u003e\n\u003ctd\u003e18 Wh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd\u003e40A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eDimensions (Length x Diameter)\u003c\/td\u003e\n\u003ctd\u003e74.5 mm (+0.3 mm ~ 0.5 mm) × 21.42 mm (+0.1 ~ 0.15 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eNet Weight \/ Gross Weight\u003c\/td\u003e\n\u003ctd\u003e72.18 g \/ 80.78 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2 class=\"speras-section-title\"\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 50px;\"\u003e\n\u003cdetails open=\"\" style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 12px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; outline: none; color: #0f172a;\"\u003eWhat makes the SPERAS PB50 battery different?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eIt uses a tabless design, which helps improve efficiency, reduce heat, and handle high-drain output more effectively than standard designs.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 12px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; outline: none; color: #0f172a;\"\u003eIs this battery suitable for high-power flashlights?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eYes, with a \u003cstrong\u003e40A continuous discharge\u003c\/strong\u003e, it is well-suited for high-performance flashlights 🔦 and similar high-drain devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 12px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; outline: none; color: #0f172a;\"\u003eDoes it include safety protection?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eYes, it includes built-in protection against overcharge and over-discharge, ensuring safe and reliable operation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 12px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; outline: none; color: #0f172a;\"\u003eIs the SPERAS PB50 rechargeable?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eYes, it is a rechargeable lithium-ion battery. Use a compatible high-quality charger for best results and longevity.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n {\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"FAQPage\",\n \"mainEntity\": [{\n \"@type\": \"Question\",\n \"name\": \"What makes the SPERAS PB50 battery different?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"It uses a tabless design, which helps improve efficiency, reduce heat, and handle high-drain output more effectively than standard designs.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"Is this battery suitable for high-power flashlights?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"Yes, with a 40A continuous discharge, it is well-suited for high-performance flashlights and similar high-drain devices.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"Does it include safety protection?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"Yes, it includes built-in protection against overcharge and over-discharge, ensuring safe and reliable operation.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"Is the SPERAS PB50 rechargeable?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"Yes, it is a rechargeable lithium-ion battery. Use a compatible high-quality charger for best results and longevity.\"\n }\n }]\n }\n\u003c\/script\u003e\n\n\u003cdiv id=\"speras-lightbox\"\u003e\u003cimg id=\"speras-lightbox-img\" alt=\"Enlarged view of SPERAS PB50 battery\"\u003e\u003c\/div\u003e\n\n\u003cscript\u003e\n document.addEventListener(\"DOMContentLoaded\", function() {\n var lightbox = document.getElementById('speras-lightbox');\n var lightboxImg = document.getElementById('speras-lightbox-img');\n var images = document.querySelectorAll('.speras-zoom');\n\n if (lightbox \u0026\u0026 lightboxImg) {\n images.forEach(function(img) {\n img.addEventListener('click', function(e) {\n e.preventDefault();\n lightboxImg.src = this.src;\n lightbox.classList.add('active');\n document.body.style.overflow = 'hidden';\n });\n });\n\n lightbox.addEventListener('click', function() {\n lightbox.classList.remove('active');\n document.body.style.overflow = '';\n setTimeout(function() {\n lightboxImg.src = '';\n }, 300);\n });\n }\n });\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Speras","offers":[{"title":"Black \/ SPERAS PB50","offer_id":46649944080561,"sku":null,"price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/PB50-1.jpg?v=1770834605"},{"product_id":"speras-n48-21700-battery-4800mah-battery-lithium-ion-battery-flashlight-battery-high-capacity-battery","title":"SPERAS N48 4800mAh 21700 Rechargeable Lithium Battery","description":"\u003cstyle\u003e\n \/* 🏆 Speras Universal Hero Banner \u0026 Layout Style *\/\n .speras-pdp-container { font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif; color: #333; line-height: 1.6; max-width: 950px; margin: 0 auto; padding: 20px; }\n .speras-hero-banner { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); padding: 50px 30px; border-radius: 20px; margin-bottom: 40px; text-align: center; border-bottom: 6px solid #ea580c; box-shadow: 0 10px 25px rgba(0,0,0,0.15); }\n .speras-hero-banner h1 { font-size: 38px; font-weight: 900; color: #ffffff !important; margin: 0 0 15px 0; line-height: 1.3; }\n .speras-hero-banner .subtitle { font-size: 18px; max-width: 850px; margin: 0 auto 20px auto; color: #cbd5e1 !important; line-height: 1.7; }\n \n \/* Comparison Table \/ Formatting *\/\n .speras-table-wrapper { overflow-x: auto; margin: 40px 0; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); border: 1px solid #e2e8f0; }\n .speras-table { width: 100%; border-collapse: collapse; text-align: left; background-color: #fff; min-width: 600px; }\n .speras-table th, .speras-table td { padding: 16px 20px; border-bottom: 1px solid #e2e8f0; font-size: 16px; color: #444; }\n .speras-table th { background-color: #0f172a; font-weight: bold; color: #fff; font-size: 16px; }\n .speras-table tr:hover { background-color: #f9fafb; }\n .speras-highlight-col { background-color: #fafafa; font-weight: bold; width: 40%; color: #111 !important; }\n\n \/* Lightbox and Hover Effects *\/\n .speras-zoom { cursor: zoom-in; transition: transform 0.2s; display: block; }\n .speras-zoom:hover { transform: scale(1.02); }\n #speras-lightbox { position: fixed; z-index: 999999; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(15, 23, 42, 0.95); display: flex; justify-content: center; align-items: center; opacity: 0; visibility: hidden; transition: opacity 0.3s ease; cursor: zoom-out; }\n #speras-lightbox.active { opacity: 1; visibility: visible; }\n #speras-lightbox img { max-width: 90vw; max-height: 90vh; border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,0.5); transform: scale(0.9); transition: transform 0.3s ease; }\n #speras-lightbox.active img { transform: scale(1); }\n\n \/* Layout Elements *\/\n .speras-section-title { font-size: 28px; font-weight: bold; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-top: 50px; margin-bottom: 30px; text-align: center; }\n .speras-grid-2 { display: flex; flex-wrap: wrap; gap: 30px; margin-bottom: 40px; }\n .speras-grid-2 \u003e div { flex: 1 1 300px; }\n\u003c\/style\u003e\n\u003cdiv class=\"speras-pdp-container\"\u003e\n\u003cdiv class=\"speras-hero-banner\"\u003e\n\u003cspan style=\"display: inline-block; background: #ea580c; color: #fff; padding: 6px 18px; border-radius: 30px; font-size: 14px; font-weight: 800; text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 20px;\"\u003ePremium Power Source\u003c\/span\u003e\n\u003ch1\u003eSPERAS N48: 21700 4800mAh Rechargeable Li-ion Battery\u003c\/h1\u003e\n\u003cp class=\"subtitle\"\u003eBuilt to deliver stable and reliable power 🔋 for everyday and outdoor use. With a high capacity of \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e4800mAh\u003c\/strong\u003e\u003c\/span\u003e and a nominal voltage of \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e3.6V\u003c\/strong\u003e\u003c\/span\u003e, it provides consistent energy output for high-performance flashlights and other compatible high-drain devices.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; justify-content: center; gap: 15px; flex-wrap: wrap; margin-top: 15px;\"\u003e\n\u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e🔋 4800mAh Capacity\u003c\/span\u003e \u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e⚡ 15A Max Discharge\u003c\/span\u003e \u003cspan style=\"background: rgba(255,255,255,0.1); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 13px;\"\u003e🛡️ Built-in Protection\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 50px;\"\u003e\u003cimg style=\"max-width: 600px; width: 100%; height: auto; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); margin: 0 auto; display: block;\" alt=\"SPERAS N48 4800mAh 21700 Rechargeable Lithium Battery front view\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/N48_1_480x480.jpg?v=1770835221\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003ch2 class=\"speras-section-title\"\u003eEngineered for Safety \u0026amp; Performance\u003c\/h2\u003e\n\u003cdiv class=\"speras-grid-2\"\u003e\n\u003cdiv style=\"background: #fafafa; padding: 30px; border-radius: 8px; border: 1px solid #f0f0f0;\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #ea580c; margin-top: 0; margin-bottom: 20px;\"\u003eReliable \u0026amp; Durable Design\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; color: #555; margin-bottom: 15px;\"\u003eDesigned with safety in mind ⚙️, the \u003cstrong\u003eSPERAS N48 battery\u003c\/strong\u003e features built-in protection against overcharge and over-discharge. This helps maintain long-term performance while extending battery lifespan.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; color: #555; margin-bottom: 0;\"\u003eIts durable construction also improves impact resistance, making it perfectly suitable for demanding outdoor environments and heavy-duty tactical use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff; padding: 30px; border-radius: 8px; border: 1px solid #e0e0e0; box-shadow: 0 2px 10px rgba(0,0,0,0.02);\"\u003e\n\u003ch3 style=\"font-size: 22px; font-weight: bold; color: #111; margin-top: 0; margin-bottom: 20px;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.8; color: #444; list-style: none; padding: 0; margin: 0;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e🔋 \u003cstrong\u003eExtended Runtime:\u003c\/strong\u003e 4800mAh high capacity.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e⚡ \u003cstrong\u003eConsistent Output:\u003c\/strong\u003e Stable 3.6V nominal voltage.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e🛡️ \u003cstrong\u003eSafer Use:\u003c\/strong\u003e Built-in protection circuits.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e🔧 \u003cstrong\u003eTough Build:\u003c\/strong\u003e Durable, impact-resistant construction.\u003c\/li\u003e\n\u003cli\u003e🔄 \u003cstrong\u003eHigh-Drain Ready:\u003c\/strong\u003e 15A max continuous discharge for powerful devices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 50px;\"\u003e\u003cimg style=\"max-width: 600px; width: 100%; height: auto; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); margin: 0 auto; display: block;\" alt=\"SPERAS N48 21700 battery specifications and capacity details\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0605\/4549\/9313\/files\/N48_2_480x480.jpg?v=1770835221\" class=\"speras-zoom\"\u003e\u003c\/div\u003e\n\u003ch2 class=\"speras-section-title\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv class=\"speras-table-wrapper\"\u003e\n\u003ctable class=\"speras-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eBrand \/ Model\u003c\/td\u003e\n\u003ctd\u003eSPERAS \/ N48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eBattery Type\u003c\/td\u003e\n\u003ctd\u003e21700 Rechargeable Li-ion Battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e4800 mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd\u003e3.6 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eEnergy\u003c\/td\u003e\n\u003ctd\u003e17.28 Wh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd\u003e15A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eDimensions (Length x Diameter)\u003c\/td\u003e\n\u003ctd\u003e74 mm (+0.3 mm ~ 0.5 mm) × 21.25 mm (+0.1 ~ 0.15 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eNet Weight \/ Gross Weight\u003c\/td\u003e\n\u003ctd\u003e70.91 g \/ 79.52 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"speras-highlight-col\"\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1 year (contact us for support or replacement)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"speras-section-title\"\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 50px;\"\u003e\n\u003cdetails open=\"\" style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 12px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; outline: none; color: #0f172a;\"\u003eWhat devices can use the SPERAS N48 battery?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eIt works perfectly with high-performance flashlights 🔦 and other electronic devices that support standard 21700 lithium-ion batteries.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 12px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; outline: none; color: #0f172a;\"\u003eIs this battery rechargeable?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eYes, it is a fully rechargeable lithium-ion battery designed for hundreds of charge cycles.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 12px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; outline: none; color: #0f172a;\"\u003eDoes it include safety protection?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eYes, it has built-in protection circuits safeguarding against overcharge and over-discharge to ensure maximum safety during use and charging.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background-color: #fff; padding: 18px 20px; margin-bottom: 12px; border: 1px solid #cbd5e1; border-radius: 8px; cursor: pointer;\"\u003e\n\u003csummary style=\"font-size: 18px; font-weight: bold; outline: none; color: #0f172a;\"\u003eHow long does it last?\u003c\/summary\u003e\n\u003cp style=\"margin-top: 12px; font-size: 16px; color: #475569; line-height: 1.6;\"\u003eWith a massive 4800mAh capacity, the runtime is significantly extended. Exact duration depends on the power consumption and output mode of the specific device being used.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n {\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"FAQPage\",\n \"mainEntity\": [{\n \"@type\": \"Question\",\n \"name\": \"What devices can use the SPERAS N48 battery?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"It works perfectly with high-performance flashlights and other electronic devices that support standard 21700 lithium-ion batteries.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"Is this battery rechargeable?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"Yes, it is a fully rechargeable lithium-ion battery designed for hundreds of charge cycles.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"Does it include safety protection?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"Yes, it has built-in protection circuits safeguarding against overcharge and over-discharge to ensure maximum safety during use and charging.\"\n }\n },{\n \"@type\": \"Question\",\n \"name\": \"How long does it last?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"With a massive 4800mAh capacity, the runtime is significantly extended. 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