Packing List: 1 x 1400mAh Lipo battery pack, 3.7V Rechargbeable Lipo Battery fits Sena 50R-01 Headset Battery Replacement. SP76 battery pack replacement. 50R headset battery replacement. Technical spec: Battery Type: Lithium polymer battery. Capacity: 1400mAh. Nominal Voltage: 3.7V. Power: 11.1Wh. Nominal work voltage: 3.0V ~4.20V. Cutoff Voltage (Discharged): 2.85V.