1430mAh 3.7V Li-ion Internal Replacement Battery For iPhone 4S+ 7pcs Tool Kit -Kim Rose (TM) Replacement Battery for iphone 4s (only) Light Weight, High Capacity & Low Impedance Li-Ion Replacement Battery 1430 mAh Extra High Capacity, extra long stand-by times Voltage: 3.7V. Battery Capacity: 1430 mAh