Just pull one of the (-) battery cables off the batteries when you're storing it without power. The self-discharge rate of flooded batteries isn't too terrible, a few percent per month, so it should be good for 3-6 months of storage w/ the batteries disconnected at normal temps. It's even easier if you install a switch instead of having to remove/reattach the cable every time, but it should be effective.
Make sure you don't have an odd setup, like some draw that attaches both its leads to one battery so there's still a circuit if you pull the (-) from the other battery.
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— David
Zero Gravitas — 2017 Flying Cloud 26U | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill
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