LOPURS Mobile Phone Battery & Cover Back Door for HTC Wildfire S / G13 / A510e Battery Specs. Capacity: 3500mAh. Battery type: Lithium Ion, Voltage: 3.7V Li-ion Battery covers with a cover back door It is recommended to fully drain and fully charge the battery especially during the first 3 charging and discharging cycles, doing so may greatly improve the overall life of the battery