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I left my MT8212B charging overnight while turned on. I checked the next morning and the battery charge was only 43%. The unit passes self test and the temperature of the unit reads 139 degrees F, is my battery bad?
If the battery temperature exceeds 45_ C while charging, the charging will stop and the charge indicator will turn off. Charging will resume automatically when the temperature drops below 45 deg. C. Your unit was reading 59 deg. C. Turn the unit off and resume charging. The battery should go to full charge after a few hours.

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