Capacity: 1100mAh Battery Type: Li-ion Voltage: 3.7V Model numbers fit to: Magellan Maestro 4000, Maestro 4010, Maestro 4000T, Maestro 4040, Maestro 4050 Compatible battery part numbers: 37-00030-001, E4MT181202B12, MX0708 RoHS approved for toxic free. CE and ISO9001 Certified for Quality Assurance. Search Tip: Press Ctrl and F keys to prompt a search dialogue box, then type in your device's model number and click 'Find Next'.