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I also have a Gel Cell battery in my airplane. It is aerbatic and can go inverted so I don't want acid spilling out. I rarely get over a year's use out of one. And, as has been said, they last better when used often. The a/c charge system does not do a perfect job either. The manufacturer recommends a trickle charge every month or so to top up the battery. I wouldn't even bother with one in the RV.
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