QCell Samsung Galaxy S2 Epic 4G Touch Sprint / Galaxy S i9000 1950mAh Slim Battery (NOT Compatible with i9100/T989/i777) Sprint Galaxy S2 Slim Battery by QCell! Premium Quality and Best Material used! Designed in Canada! Slim Profile Design with Maximum Cell Efficiency! Able to use original batter cover! DYNAStop overcharge IC stopper built in! Voltage: 3.7V / Li-Ion Battery