Replace your Garmin Nuvi 66LM Battery or Keep an Extra Battery on hand as a backup. This kit comes with an Extended Capacity 1100 mAh, Lithium-Ion Battery that offers up even more up time than your original. Works in your Garmin Nuvi 66LM GPS. Simple, Easy and Inexpensive! You get a New Battery, FREE Tools (necessary for installation), Video Instructions AND You also get a full ONE YEAR Money Back Guarantee exclusively when you purchase Innovate88's Garmin Nuvi 66LM Battery Replacement Kit.