Its fried! Google "battery minder" and you will find what you need. You didn't necessarily overcharge your batteries if they are the original. They may have just given up at 5-6 years old.
BTW...welcome to iRV2.
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Jim with Judy
2017 Newmar Ventana 4369, 2005 Jeep Wrangler (Rock Crawler), 2016 Jeep Wrangler (Mall Crawler)
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