Samsung EB-F1A2GBU 1650 mAh Battery Sealed in Retail Packaging for Samsung Galaxy S II GT-I9100 / Galaxy S II GT-I9108 / Galaxy S II SGH-I777 Model Number: EB-F1A2GBU Type: Lithium Ion Capacity: 1650mAh Voltage: 3.7V Compatible Samsung Devices: Samsung Galaxy S II GT-I9100 / Galaxy S II GT-I9108 / Galaxy S II SGH-I777