Charge on the go, with the Samsung 2100mAh Battery Pack mini. With a universal USB port output, you can charge smartphones or other electronics capable of charging via USB. The battery pack comes with an included USB to Micro USB cable for charging a mobile device from the battery or charging the battery via a USB charging source (not included). The battery pack's 2100mAh capacity can be recharged over and over. When fully powered, the battery pack holds enough juice to provide up to half a charge for most smartphones.