HQRP Rechargeable Battery Pack for UNIDEN GMR2889-2CK GMR3699-2CK GMR2875-2CK GMR3689-2CK GMR638 GMR638-2 GMR638-2CK GMR638-3CK Two-Way Radio plus Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 4.8 Volt; Capacity: 700 mAh; Ni-Mh; Keep in touch with friends and family and never miss a conversation; 100% compatible with Original Battery; 200 Days warranty!