Originally Posted by phargo#1018
While checking terminations, don't forget to check the terminations at the battery terminals. If you checked these early in the season and haven't since, this would be a good thing to do.
You may also want to check the battery terminals to make sure that they are free from corrosion - if you do see signs of corrosion you may need new batteries.
The OP mentioned that the batteries were hot as well. Were they uniformly hot, or was the heat concentrated in one area. As batteries age, they will eventually drop a cell. Under load that cell will be much hotter than the other cells.
Here is a thermal image of a battery that demonstrated a failed cell under testing this year.
The batteries weren't hot themselves, only the battery connector cable. It got more hot towards the end of the connector and it was normal temperature after the main breaker's battery connector.