Two 6v in series, like T-105's or T-125' will take repeated heavy discharges and come back for more. The so called "RV/Marine" batteries are combination starting and house batteries and will not take the abuse of the 6v golf cart batteries.
I'm sure Mr. Battery will be along shortly with charts and graphs to explain this more in detail, but you can save yourself the retina burn and just get the 6v's.
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Making a smooth transition to senility for over 70 years
2017 Freedom Elite 29fe
2015 Jeep Wrangler Toad
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