The Ultimate 2-in-1 Charging Device
SPERAS PD21700 Smart Battery Charger & Power Bank
Don't just charge your flashlights; charge your life. The SPERAS PD21700 isn't just a high-efficiency smart charger for your 21700 and 18650 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.
Why the PD21700 Outperforms the Competition
Most chargers do one thing. The PD21700 works twice as hard, bridging the gap between edc gear maintenance and everyday digital survival.
| Feature |
Standard Chargers |
🔥 SPERAS PD21700 |
| Functionality |
Charger Only |
2-in-1: Charger + Power Bank |
| Slot Control |
Shared Current |
Independent Detection & Control |
| Battery Health Tech |
Basic Trickle |
TC/CC/CV 3-Stage Charging |
| Conversion Efficiency |
~70% - 80% |
Up to 90% Efficiency |
Core Professional Features
More Than a Charger: It's a Power Bank
Equipped with innovative parallel balance charge-discharge technology, 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 smartphone, GPS, or other USB devices in an emergency.
Independent Dual-Slot Smart Control
Capable of charging two batteries simultaneously without interference. The built-in microcomputer independently controls each slot, automatically detecting the battery's voltage. Intuitive LED indicators clearly display the real-time charging status so you are never left guessing.
TC/CC/CV 3-Stage Charging
We 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 power conversion efficiency of up to 90% and precisely cuts off at exactly 4.2V when fully charged to prevent degradation.
Multi-Layer Defense System
Safety is never an option; it's a standard. The charger features comprehensive protections including Reverse-Polarity, Short Circuit, Overcharge, and Overheat protection. Furthermore, the entire chassis is constructed from high-grade flame-retardant material for ultimate peace of mind.
PD21700 Design & Dimensions
Technical Specifications
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Compatible Batteries: 21700 and 18650 Li-ion batteries
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USB Input: 5V/2A
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DC Output: DC 4.2V / 1A * 2 slots OR 2A * 1 slot
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Dimensions: 110mm (L) * 48.4mm (W) * 28.9mm (H)
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Weight: 76.9g (net weight) / 146g (gross weight)
📦 What’s in the Box:
- 1 × SPERAS PD21700 Smart Charger
- 1 × USB Charging Cable
- 1 × User Manual
Frequently Asked Questions
How exactly does the Power Bank feature work?
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.
Can I charge one 21700 and one 18650 at the same time?
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.
Is it safe to leave my batteries on the charger overnight?
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.
![Enlarged view of SPERAS PD21700 charger]()