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I would guestimate that your battery has given up the ghost since it was drained down completely. Once this happens it is extremely hard to get the battery to hold a charge period. It would be my opinion that you should replace that battery and while you are at it I would put in a second battery. If I'm not mistaken your model unit has a residential refrig and if that is the case a single battery will be depleted in no time at all while you are even driving down the road.
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