HQRP Two-Way Radio Rechargeable Battery Pack for UNIDEN BP-40 / BP40 Replacement fits GMR2238-2CK GMR2240-2CK plus Coaster HQRP&reg; Replacement 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; 200 Days warranty!