... output: 5V, 1000mA 3. built-in battery: 3.7V,2200mAh UPS battery bank for mobilephone:1. Fashionable design, aluminum shell, ... standard USB design, inner there is 2500mAh Li-battery. 3. It has unique circuit design, which ... can indicate the charging performance, also can improve the battery’s service efficiency. 4. Without any external power ... camera, MP3, Mp4 and so on. UPS battery bank for mobilephone