EC TECHNOLOGY&reg; 2 x 1900mAh Li-ion Batteries For Samsung Galaxy S II S2 GT-I9100, Galaxy S2 II I9100G Only For I9100, NOT Compatible With Sprint Galaxy S2 II D710 (Galaxy S II Epic Touch 4G), NOT Compatible With AT&T Galaxy S2 II(SGH-I727), NOT Compatible With T-mobile Galaxy S2 II(SGH-T989)+ 1 x Travel Charger Type: Li - ion battery; Voltage: 3.7V. Capacity: 1900mAh, more than 500 charge cycles Compatible with Samsung Galaxy S II S2 GT-I9100/ i9100/ Galaxy S2 II 9100G package:2xbattery&1Xcharger Charger: output: 4.2V/600mA, USB output 5V/600mA, multi-purpose, multi-connector.