HQRP TWO Headset Batteries compatible with Plantronics AWH-54 / AWH54, AWH-55 / AWH55 plus Coaster HQRP&reg; TWO Rechargeable Batteries plus HQRP&reg; Coaster; Battery Voltage: 3.7V; Capacity: 250 mAh; Li-Pol; 100% compatible with Original Battery; 200 Days warranty!