HQRP Battery compatible with Sportdog SportHunter 1800 model SD-1800 SR200-IM Remote Controlled Dog Training Collar Receiver plus HQRP Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 4.8V; Capacity: 750 mAh; Ni-Mh; 100% compatible with Original Battery; 200 Days warranty!