HQRP Battery for Sportdog ProHunter 2500 SD-2500 ST101-P ST101P Remote Controlled Dog Training Transmitter Pro-Hunter SAC00-11816 MH500AAAH10YC S402-3395 + Coaster HQRP&reg; Rechargeable Transmitter Battery plus HQRP&reg; Coaster; Battery Voltage: 12V; Capacity: 500 mAh; Ni-Mh; 100% compatible with Original Battery; 200 Days warranty!