2250 mAh Extended Slim Battery for T-Mobile Samsung Galaxy S2 (SGH-T989D) Buy this Kit and always keep a charged spare battery in your pocket Capacity: 2250 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.