Just thought I'd share For the past 4-5 years I've been running 4 or 5 trail cams and using the Energizer Lithium Ultimates in them. As most of you know, these batteries are not cheap. And being that I have to drive an hour to check my cams I just cant justify putting alkalines in them. Well after about 3 years now I have accumulated a small fortune of these batteries because every year I put new ones in the cams come summer time since I tend to only run my cams from July through November and then I bring them home. Well I got this ZTS MBT-1 battery test off Amazon and what a fantastic little unit from a great company. I even called them and talked to a guy for about 30 mins who really explained to me how they work and whatnot. Needless to say about 80 of my batteries are still 80% charged so it already paid for itself. If anyone is looking for a tester I highly recommend you check this one out. ZTS MBT-1 - Multi-Battery Tester - For More Than 30 Battery Types - - Amazon.com