... 3.Voltage:5V 4.Capacity:2200mAh portable power bank for mobile phone Basic parametersOutput Voltage: DC5.0V±0.25VOutput Current:≥ 500mA ... power bank is a high-performance USB interface, mobile power, using high-quality ultra-thin Li-Polymer batteries designed, good security; built-in ... all charging devices with a USB interface s,uch as mobile phone battery, iPhone4 battery , PSP, IPOD, MP3,MP4, PMP, ...