The Fenix ARB-L21-5500U is a high-capacity 21700 Li-ion rechargeable battery built to deliver maximum power and extended runtimes. Featuring an integrated USB Type-C charging port, it allows for quick, convenient recharging without the need for a separate charger*.

Engineered for safety and long-term durability, the battery includes a built-in protection circuit in the anode to prevent short circuits, overcharging, over-discharging, and overheating. Integrated pressure relief vents safely expel waste gas in the rare event of an internal short circuit to prevent explosions. With a 5500mAh capacity and a 10A maximum output current, it is rated to retain up to 75% of its original capacity even after 500 charge cycles.

*Charging cable not included.