LOPURS 2450mah Bl-5c High Capacity Gold Business Battery for Nokia N72 / N71 Battery Specs. Capacity: 2450mAh. Battery type: Lithium Ion, Voltage: 3.7V Li-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