The SPERAS 21700 Dual‑Slot USB‑C Battery Charger is a versatile and reliable charger designed for flashlight and battery enthusiasts who need to charge multiple lithium-ion cells efficiently. It supports large-capacity cells such as 21700 and 18650, as well as smaller Li-ion sizes like 16340, 14500, and more.
Each slot can deliver up to 1 A of charging current, allowing two batteries to be charged simultaneously. The charger accepts a 5V/2A input via USB‑C, making it compatible with standard USB power supplies, power banks, or USB adapters. It also offers individual slot control, meaning you can insert one battery or two, and each will be detected and charged independently.
With protections built in—such as overcharge prevention, reverse polarity protection, and more—it provides safe and efficient charging. Its compact size and broad compatibility make it ideal for everyday users, flashlight hobbyists, or professionals needing a dependable battery charger.
Key Features:
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Dual independent charging slots
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Supports 21700, 18650, 16340, 14500, and other Li-ion/IMR cells
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Up to 1 A current per slot
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USB‑C input 5V/2A
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Independent slot detection and control
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Safety protections (overcharge, reverse polarity, etc.)
Specifications Table:
| Specification |
Details |
| Input |
DC 5V / 2A (USB‑C) |
| Output Voltage |
4.2V ± 0.05V |
| Output Current per Slot |
1000 mA (1 A) |
| Compatible Batteries |
21700, 26650, 18650, 18350, 16340, 14500, etc. |
| Protection Features |
Overcharge, reverse polarity, etc. |
