HQRP Battery for Sony DRBT22 Wireless Stereo Headset BT-22 DR-BT22 3-270-973-21 + HQRP Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.7V; Capacity: 350 mAh; Li-Pol; 100% compatible with Original Battery; 1 Year warranty!