Kit - 2 X Battery + Charger : 1800 Mah Extended Slim Design Battery for HTC Ace, HTC Desire Hd, HTC Inspire 4g, HTC Surround, Bd26100 Buy this Kit and always keep a charged spare battery in your pocket This is a High Quality Battery for the HTC Desire HD, Inspire 4G, HTC, HTC Surround, HTC Ace Capacity: 1800 mAh; (longer battery life compare to standard 1230 mAh 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.