LOPURS 2430mah Ba700 High Capacity Gold Business Battery for Sony Ericsson Xperia Neo Mt15i / Xperia Pro Mk16i Battery type: Lithium-ion , Voltage: 3.7V Lithium-ion Good quality and durable to use 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