HQRP Battery Kit for SportDOG SportHunter 800 SD-800 SD800, 650-058 ST-120 ST120-BCE Remote Dog Training Collar Receiver and Transmitter Sport-Dog + Coaster HQRP&reg; Rechargeable Transmitter and Collar Batteries Replacement plus HQRP&reg; Coaster; Collar Battery Voltage: 4.8V; Capacity: 180 mAh; Ni-Mh; Transmitter Battery Voltage: 7.2V; Capacity: 210 mAh; Ni-Mh; 200 Days warranty!