This tester is easy to use and the scale is legible and logical. However, for many batteries they will still register near the top of "Good" when it's clear from what they're had to be removed from that they're not. This is particulary true of CR123A batteries. Frankly, I have never had any bad battery register as "weak" or "poor". Is this device truly measuring resistance in the battery or is it just confirming residual voltage?
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