{"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%); 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; 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}\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 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. 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