The Sightmark Quick Detach Mini Battery Pack SM28004 is designed to extend the battery life of your optics and other USB-compatible devices. This Picatinny-mounted battery pack features a 6,000 mAh rechargeable lithium-polymer battery and a patent-pending toolless quick detach mount for easy installation and removal. The battery pack includes a battery life indicator and is constructed from durable, flame-retardant ABS material. With universal USB compatibility, this mini battery pack is a versatile addition to any shooter's toolkit. Sightmark Quick Detach Mini Battery Pack SM28004