HQRP Battery for Birdog USB Satellite Finder Meter 2.5/3 / 4 Bir-Dog BP7233-2 USB Plus BIRDOGUSBPLUS + HQRP Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 7.2V, Capacity: 3300mAh; Ni-Mh; Compatible with Original Battery; 200 Days warranty! Fits all BirDog meters except the Ultra.