Fenix ARB-L21-5000U Li-ion Rechargeable 21700 Battery with Micro USB Charging Port
The Fenix ARB-L21-5000U is a high capacity 21700 Li-ion rechargeable battery with a protection circuit in the anode to help prevent short circuits, overcharge/discharge and overheating. The battery also includes pressure relief vents that expel waste gas in the rare case of an internal short circuit preventing an explosion.
USB Type-C charging interface
The protective circuit inside the anode
500 charging circles
Please note that this battery is NOT a 18650 battery and it is not compatible with 18650 battery-powered lights. To use this battery, your device MUST be compatible with 21700 batteries.