HQRP Battery for Tri-tronics Multi-Sport 2S, Multi-Sport 3S, Sport 50S, Sport 60S, Sport Series- 50, 60, 65BPR, Pro 500XL, Pro 500XLS Remote Controlled Dog Training Collar Receiver plus Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.6V; Capacity: 800 mAh; Ni-Mh; Compatible with Original Battery; 200 Days warranty!