Directly charge the Fenix 21700 Li-ion battery, ARB-L21-5000U, through the integrated USB-C charging port on the end of the battery. Fenix ARB-L21-500U provides sufficient power, and steady performance, and the capacity of the 21700 battery is twice as powerful as the common 18650/2300mAh battery. It provides compatible lighting tools with sufficient power and longer duration. Multiple protection, ensures safety and good performance of the battery; Steel shell riveting technology, fully protects the battery against damage; Pressure relief vents, rapidly expel internal gas. USB-C Charging cable is not included.
