Bastex Replacement Battery For Nokia Lumia 630,635,638,BL-5H (1950 mAh) Battery Specs. Capacity:1950mAh. t 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 Battery type: Lithium Ion, Voltage: 3.7V Li-ion