Kit - 2 X Battery + Charger :1800 Mah Extended Slim Design Battery for HTC Merge, HTC Thunderbolt, HTC Mytouch 4g Buy this Kit and always keep a charged spare battery in your pocket This is a High Quality Battery for the HTC Merge, HTC Thunderbolt, HTC myTouch 4G Capacity: 1800 mAh; (longer battery life compare to standard battery) Same size as standard battery. Do NOT required to use bulky back cover. Please allow the battery to "Condition" with fully charge and discharge 5 times to enjoy max charge capacity.