Replace your Garmin Drive 40LM Battery or Keep an Extra Battery on hand as a backup. This is an Extended Capacity 1100 mAh, Lithium-Ion Battery. Works in your Garmin Drive 40LM GPS. Simple, Easy and Inexpensive! You get a New Battery, Special Tools Necessary for Battery Installation, helpful Video Instructions, AND You also get a full ONE YEAR Money Back Guarantee exclusively when you purchase from us!