I was also using them in several trail cams around the property because they would last roughly 10-to-12 months before replacement. I recently went to buy another couple of 48-packs and found the price had significantly increased. The cellular cameras I use offer a rechargeable lithium pack and comparing to lithium AA I found I could pay for the rechargeable pack in less then two sets of AA lithium batteries. Unfortunately, you cannot safely charge AA or AAA lithium batteries as they are designed as single-use items.

Since I also kept a supply of Lithium batteries on hand for household uses (radios, flashlights, range finders) I began looking at other options for batteries. Several years ago my wife had bought me a set of Eneloop batteries and charger in a case.