My guess is that there was a faulty cell which caused over charging. I think your alternator is fine, replace the battery. Don't drive with it like this, I read they can explode. Others who know more will chime in. I just changed mine out, new in 11. -Shane
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2015 Comp Orange Procharged GT Mustang
2018 Grey Ford F150 XLT Sport 4x4
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