IMAGE Samsung Galaxy S2 SII i9100 External Backup Battery Case Battery Pack 2200mAh - Black(Not fit for SPRINT Epic Touch 4G Version/T-Mobile Version/SGH T989/Virgin Mobile D710) Cell type: Li-polymer battery. Capacity: 2200mAh Output voltage: 5V. Output current: 750mA. Input voltage: 5V. Input current: 500mA Cycle life: 500 times. Charging time: 4-5hours Color: Black. Item dimensions: 135.8 x 69.0 x 16.9mm Package Include: 1 x Black Backup Battery Case for Samsung Galaxy S2 SII i9100