2300 mAh Extended Slim Battery for Samsung Ativ S SGH-t899M (EB-L1M1NLA) This is a High Quality Battery for Samsung Ativ S Capacity: 2300 mAh; (longer battery life compare to standard battery) Same size as standard battery. Do NOT required to use bulky back cover. Quick charge with automatic constant current control prevents battery from overcharging, short... Please allow the battery to "Condition" with fully charge and discharge 5 times to enjoy max charge capacity.