QCell 2x Samsung Galaxy S2 i9100 1700mAh Slim Battery + FREE Universal Battery Charger (NOT Compatible with i727/T989/D710/Ii778) Galaxy S2 i9100 Razor Slim Battery. Designed in Canada. Slim Profile Design with Maximum Cell Efficiency Comes with Free Universal Battery Charger - Charger includes USB port for microUSB charging DYNAStop overcharge IC stopper built in Voltage: 3.7V / Premium Quality and Best Material used