HQRP Battery for Magellan Promark 3, Thales CX, Thales MMCE, Thales MobileMapper, ProMark3 RTK, Ashtech Mobile-Mapper CX GIS-GPS Receiver 111141 37-LF033-001 980782 Pro Mark + Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.7V; Capacity: 3960mAh; Li-Ion; 100% compatible with Original Battery; 200 Days warranty!