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.

Much better than the cheaper battery testers. Definitely worth the extra cost. Very easy to use.

I like the fact that it has its own battery. It seems sturdy enough so far and works well.

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

works great. all batteries accepted/

Fácil de usar, fiable y economico

J'ai un testeur de courant qui permet de vérifier le niveau des batteries. Par contre, parce que je ne l'utilise que rarement, je me demande à chaque fois si je l'utilise correctement. De plus, je dois connecter le fils rouge & noir à chaque fois, mettre le bon réglage et utiliser les pointes des contacts correctement. Il y a quelques jours, je me suis dit qu'il devait exister une solution plus simple pour ce problème simple. J'ai commandé cet appareil et viens juste de tester une dizaine de batteries. C'est fou comme c'est fabuler à utiliser. Pas d'opération "complexe", juste à mettre la batterie dans le bon emplacement et l'affichage du niveau de charge apparaît. La vie sera plus facile dorénavant :)

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

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.

Nothing at all wrong with this product, is exactly as advertised and works like a dam. Easy to use and serves as a battery check for an array of battery sizes including button batteries, a time saver for sure. Awesome unit for sure and would highly recommend.