Specifically engineered to fuel the SureFire XSC micro-compact WeaponLight series, the SureFire B12 is a quick-detach, rechargeable lithium-polymer battery that can be swapped fast without removing the XSC from the host pistol. The compact B12 powers the 350-lumen XSC for up to 30 minutes. Its charge status can be checked quickly by pressing the push-button fuel gauge switch located on the side of the battery and observing the green, yellow and red LED indicators. Features: The genuine power source for the SureFire XSC micro-compact WeaponLightQuickly detaches from XSC chassis for fast battery swapsSaves money by offering convenient rechargeability with SureFire's CH21 Cradle Charger SureFire B12 Lithium Polymer 3.7V Rechargeable Battery for XSC WeaponLights B12