I have a Ryobi 18v lithium battery that apparently won't charge. When I put it into the charger, the red light blinks for a couple seconds to do it's test and then goes solid red and the green light starts flashing. This says the battery is not faulty and it's charging. After awhile, the green light goes solid to say it's charged. However, when I take the battery out, I push the little tester on it and nothing. I have 2 batteries, both came in the same "kit" with the tools less than 2 years ago and the other battery charges/works just fine.
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