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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The bubbling could mean something (or not).
The one that bubbles more is the one with the higher voltage? Doesn't fit with the way a battery will bubble more when it is older near end of life. Besides their SGs are ok. If sulphated, SG would be more like 1.260 as its max.
To try new ways around in case of some uneven charging for whatever reason, I would also swap the series connector to the other posts and now use the old series ones for pos and neg, just to vary things.
The one that bubbles more is the one with the higher voltage? Doesn't fit with the way a battery will bubble more when it is older near end of life. Besides their SGs are ok. If sulphated, SG would be more like 1.260 as its max.
To try new ways around in case of some uneven charging for whatever reason, I would also swap the series connector to the other posts and now use the old series ones for pos and neg, just to vary things.
