HQRP 1500mAh Battery for Magellan Maestro 4200 4210 4220 4250 K4790SA108821 GPS Navigator + HQRP Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.7V; Capacity: 1500 mAh; Li-Ion; Compatible with Original Battery; 1 Year warranty!