LI-Ion Battery LI-Ion Battery 3 of 71 Ok let’s get started. The first thing I needed to do was find a Li-Ion battery that would fit in the cam and hopefully have a charging circuit that would fit inside the cam. This turned out to be a little harder than I thought. I made a trip to our local battery store and was informed that there was no such thing as a 1.5v AA sized rechargeable battery. I knew that this was incorrect as I had seen such batteries on the net. I actually found just what I was looking for at Wal-Mart! A 3v digital camera battery pack with charger.