ONE STORE Samsung I9100 Galaxy S2 Sa-i9100/gt-i9100 Premium Quality 3500mah High Volumn Extended Battery and Battery Back Cover Case for Samsung I9100 Galaxy S2 Sa-i9100/gt-i9100 Mobile Phone 3500mAn high volumn rechargeable li-Ion battery ,make your phone use longer Made from the high quality Come with a black back plastic cover case which designed specail for this high volumn battery Leave the battery/your phone on the charger for an additional 2-3 hours after the charging indicator turns green or the battery status shows full. Compatible with :Samsung i9100 Galaxy S2 SA-I9100/GT-i9100