Silver Battery Tester for AAA AA C D 9V N 1.55V Button Cells - LCD Display Power Indicator (No Batteries Required) - Essential Electrical Equipment for Home Improvement & DIY Projects - Perfect for Testing Household Batteries, Toys, Remote Controls & Electronic Devices

Okay, so it's a bit of a nuisance to actually USE the thing, but I got my stride by the third battery, and found that it suits my needs to a "T!!"I had bought a wonderful two-sided case to store my various groups of batteries, but I hadn't found a reliable way to test the viability of any stragglers along the way.True, it couldn't be more basic - which is a little unsettling! - but it costs next to nothing and it is surprisingly accurate. You will have to fiddle with it at first, but then you should be fine. And best of all, it allows me to quickly assess a battery's viability so it can be disposed of properly at our town's landfill.