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The 6v battery may have a higher amh value than the 12v which means it may take a bit longer to charge I believe. I've had batteries take a bit longer than a day to charge fully. Make sure that you have your selector on "6v" and not "12v" too. Throw a voltmeter on it and check it, give it a bit more time, and then if all else fails, then take it back.
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