Replace your Garmin Nuvi 57 Battery or Keep an Extra Battery on hand as a backup. This is an Extended Capacity 1100 mAh, Lithium-Ion Battery that offers up even more up time than your original. Works in your Garmin Nuvi 57 GPS. Simple, Easy and Inexpensive! You get a New Battery, a FREE Special Tools (necessary for installation), a Video Installation Guide AND You also get a full ONE YEAR Money Back Guarantee exclusively when you purchase from us.