Fenix 6000mAh 21700 USB-C Rechargeable Powerbank Battery The Fenix 21700 rechargeable battery combines a 6000mAh rated capacity with a 3.6V voltage specification. Its USB-C charging port is built into the battery, providing a direct charging connection. The 21700 format identifies the battery size class to match to a compatible device, while the capacity states its charge-storage rating. This version is also identified as a powerbank battery, adding a power-supply role beyond its use as a rechargeable cell. USB-C specifies the charging connector type. Battery size and voltage remain separate from capacity, so all three specifications matter when selecting the correct cell. The black appearance identifies the stated configuration. Key Features Rated capacity: 6000mAh charge-storage specification. USB-C port: Built-in charging connector. Rechargeable format: 21700 size-class battery. Voltage: 3.6V specification for compatible devices. Specifications Manufacturer: Fenix Size class: 21700 Capacity: 6000mAh Voltage: 3.6V Charging port: USB-C Color: Black Additional function: Powerbank Shop the Fenix 6000mAh 21700 USB-C Rechargeable Powerbank Battery at BattleHawk Armory.