Tenergy T-333 Universal Battery Tester, LCD Display, Cell Checker, Multi-Purpose Small Battery Tester, for AA, AAA, C, D, 9V, CR123A, CR2, CRV3, 2CR5k CRP2, and Button Cell Batteries

What a great tool: simple, functional, always "just works". I've had it now almost 5 years, same model (t333, listed now as a "Amazon choice") and I'd bought it at same price shown now. That's sweet. If you need a battery tester, buy it, as it handles so many types-- even button ones, and is so easy. (Indeed, it takes one AAA battery, which I'd totally forgotten about until finding this listing again. I've not changed it since purchase! Of course, it may depend on how often you're testing: I might test a couple a month. But it's lasting.)

Had a basic tester, but bought this one to be able to test my security system button batteries. This one does them all - and I tested them all and it gave accurate results, even for batteries at less than 100%. Simple and inexpensive. Smart product.

This works really well. As long as it doesn't break within a year or so, then I will be happy with it for the price. I do not recommend those battery testers that aren't electric. If they aren't electric they are awkward to use, and don't really give you a good reading. This uses a battery included to make it work, and therefore is very easy to use. The slots for the different batteries are just the right size and you just have to stick it in and you immediately see how the charge is on the electric meter. Really good product for the price!

This works somewhat well but when I use it to test carbon zinc batteries that are shown to be half way. They don't seem to work. Works well with alkaline batteries and rechargeable batteries.

This is an excellent battery tester. Easy to use and see when battery needs to be replaced.

This is the best battery tester I've ever had! The various size batteries easily and quickly fit in their appropriate size chamber, and don't fall out or slide around like happens in some testers. After buying one, I bought 2 more for Christmas presents!

Has the ability to measure the current in literally any battery made. Unbelievable range and accuracy. And, decides current into 12 levels from extremely poor to excellent. Very useful

This is thing I never knew I needed. It works amazing!

Fácil de usar, fiable y economico

Lightweight and accurate tester....can test all batteries in seconds. Size of a adult hand

Good value for the price. Easy to use & is able to test a variety of sizes (even the round CR2032 for example) EXCEPT AAAA’s. We’re fairly confident it’s accurate.

Especially useful if you use smart home devices such as door/window sensor, zigbee buttons, bluetooth temperature sensor etc., that runs on a wide range of battery types. So you can check if the low battery warning is accurate before you change the battery.

It works as one would expect it to.