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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I'm not far from you if you ever want to equalize the 6v's individuality. But reading this morn is sounds like everything is ok.
