Replace your Magellan Roadmate 5120LMTX Battery or Keep an Extra Battery on hand as a backup. This is a High Capacity 1050 mAh, Lithium-Ion Battery that offers even more up time than your original. Works in your Magellan Roadmate 5120LMTX unit. Simple, Easy and Inexpensive! You get a New Battery, FREE Special Tools (necessary for installation), an Installation Video Tutorial, AND You also get a full ONE YEAR Money Back Guarantee exclusively when you purchase from us!