I have 4 6V 260A Crown batteries. They are 5 years old and don’t like to charge op to good. After charging and disconnected only 12.69V, day after at 12.57v . Gravity of cells from 1275 to loves tat 1...
I'd investigate the Lithium option, too... pricey, but long term savings and benefits now to then are impressive... some will disagree, but that's your option... freedom of choice
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