I think I'm looking at new batteries.
I have a pair of interstate Costco 6v that are about 3 years old. We don't boondocks anymore and the trailer is at the ranch and hooked up constantly. PD9855 (?) does the charging. I did a SOC ...
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Final report - I put the batteries back in and turned off the disconnect. After 3 days they are still at 12.7. All is well.
