3.7V 850mAh Rechargeable Li-ion Power Battery 1.8×1×0.4 Inch

3.7V 850mAh Rechargeable Li-ion Power Battery Dimension: 1.8 x 1 x 0.4 inch Capacity: 850 mAh Output Voltage: 3.7 V Charging Voltage: 4.2 V