Battery. Why is it so?

Submitted: Wednesday, Aug 03, 2016 at 12:52
ThreadID: 133136 Views:4122 Replies:9 FollowUps:7
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My van has 2 X 6 volt batteries in series. The SOC is showing 100% & voltage 12.7.
I have just disconnected & removed the batteries in order to check water levels and hydrometer test. 5 cells in the green & 1 on border of green/white.

My question is: Why is it that when I re-installed the batteries the SOC has dropped to 65%?

The same problem occured when I last checked the batteries and it took several days, using both the solar & charger, to restore SOC to 100%.

Cheers
Ted
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