The Fenix ARB-L21-5000U 21700 Rechargeable Lithium-Ion Battery with USB-C Charging Port is designed for flashlights and other high-drain devices requiring increased battery capacities and extended runtimes. The cell maintains its output for long periods of time, and this battery has its own USB-C charging port for quick and easy charging without the need for a separate charger. Safety features include a protection circuit in the anode to help prevent overcharging, discharging, overheating, and short circuits. Additionally, pressure relief vents expel waste gas in the rare case of an internal short circuit. The battery is engineered for 500 charging cycles and is compatible with the ARE-A2, ARE-A4, ARE-D1, and ARE-D2 battery chargers.
Note: USB C cable not included
