I was fortunate to start out with radios that had one good battery and one that didn't hold a charge. I put a new battery in the radio, nothing. It appears to be charging but the radio has no power. After 30 minutes of fiddling and measuring, I found that the shrink wrap insulation was too close to the negative terminal to make contact. The positive pole didn't look open enough either. A little trimming and everything works. Five stars for fast shipping and the battery I needed, 1 star because it was unusable out of the box. If the battery had actually been tested for the application the problem would have been easy to spot but the customers are quality controllers/repair techs. See photo - in the foreground a usable battery, behind it a "hacked" battery.
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