HQRP Battery Pack compatible with Plantronics 63421-01 64376-01 Replacement plus HQRP Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.6V; Capacity: 800 mAh; Ni-Mh; ompatible with Original Battery; 200 Days warranty!