Replace your TomTom Start Battery or Keep an Extra Battery on hand as a backup. This is an Extended Capacity 770 mAh, Lithium-Ion Battery that offers even more up time than your original. Works in your TomTom Start GPS. Simple, Easy and Inexpensive! You get a New Battery, FREE Torx and Shim Tools (necessary for installation), an Installation Video, AND You also get a full ONE YEAR Money Back Guarantee exclusively when you purchase from us.