Riin 3600mah Extended Battery for Samsung Galaxy S2 S II S 2, I 9100, I9100, GT-I9100, I9100G, with Black Modified Battery Cover Rechargeable and removable power for i9100 Conductor use 100% pure nickel strap Rating: 3600 mAh Keep a spare on hand or replace your dead battery and battery cover Integrated microchip prevents overcharging & lengthens battery life