Dlyfull B4 Universal Battery Tester ZDNET's key takeaways This battery tester handles a massive array of batteries, from one-use alkaline batteries to rechargeable cells.
It's quick and easy to use, and can be used to test whether rechargeable batteries have come to the end of their life.
The small display can be hard to read. View now at Amazon
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I've lost count of how many times I've seen someone throw away good batteries. Man, those things cost money, and it's so wasteful. But it seems to be the first thing people do when something isn't working.
Also: The best rechargeable batteries you can buy
Before I toss a battery into the recycling, I always test it. I generally use a multimeter, but that involves knowing what the voltages of a battery are when they're full and dead, so unless you have a brain that remembers stuff like that over people's birthdays, this isn't a practical method.
But fear not, because I've found a really cool battery tester that's easy to use, accurate, and can be used with virtually any battery you'll find around the home -- both one-use and rechargeable.
And when I say pretty much any battery, I mean just that. The Dlyfull B4 battery tester works with 1.2V Ni-MH, 1.45V zinc air, 1.5V alkaline, 3.0V lithium manganese, 3.2V LiFePO4, 3.7V Li-ion, and 6.0V, 9.0V, and 12.0V Alkaline packs. It is compatible with AAA, AA, C, SC, D, N and PP3 sizes, as well as a whole range of button cells, including CR123A, CR-V3, 2CR5, 23A, and 27A.
The Dlyfull B4 can test a lot of different times of battereis. Adrian Kingsley-Hughes/ZDNET
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