Replace your Magellan Maestro T0052 Battery or Keep an Extra Battery on hand as a backup. This is a Super High Capacity 1100 mAh, Lithium-Polymer Battery that offers even more up time than your original. Works in your Magellan Maestro 3000 Series GPS units, replacing battery part no. T0052. Simple, Easy and Inexpensive! You get a New Battery, FREE Special Tools (necessary for installation), Video Instructions, AND You also get a full ONE YEAR Money Back Guarantee exclusively when you purchase from us!