EC TECHNOLOGY&reg; High Quality 2 x 1600mAh Li-ion Battery For HTC Desire HD, Inspire 4G, Surround 7, A9191 ACE G10, Free 1 x Travel Charger Type: Li - ion battery; Voltage: 3.7V. Capacity: 1600mAh, more than 500 charge cycles Compatible with HTC desire HD, Inspire 4G, A9191/ACE/G10, Surround 7 package:2xbattery& 1xcharger