I have no perspective on the battery testers, but it fully meets my needs: I had amassed a large number of batteries and different formats, and before the drop at the sorting center of my supermarket, I wanted to ensure that they had nothing more to give. What a surprise when I realized that more than 2/3 were still functional and usable !! In fact, when a battery device stops working, it is because a battery has run out of juice ... but others may have yet! The price of batteries, buying a battery tester is quickly amortized !!
