Power supplier,external battery,Backup battery for iphone 3g 3gs 4g 4gs for ipod touch,nano classic Power supplier,external battery,Backup battery for iphone 3g 3gs 4g ... portsHigh-capacity, rechargeable lithium-ion batteryLED indicator for battery power levelNo memory effect, Li-ion battery built-inBattery type: Lithium-ion battertyCapacity:1900mAhInput ...