... 3.Voltage:5V 4.Capacity:2200mAh portable power bank for mobile phone Basic parametersOutput Voltage: DC5.0V±0.25VOutput Current:≥ 500mA ... ~5.5V(computer USB Interface or optional charger)Input Current: CC 500mABattery Type: 18650Rated capacity: 2200mAhCycle life: ≥ 500 timesDimensions: ... all charging devices with a USB interface s,uch as mobile phone battery, iPhone4 battery , PSP, IPOD, MP3,MP4, PMP, ...