A battery typlicly loses about 1% of power a day. It is better to keep it fully charged before storage, also is it going to freeze where it is stored? A weak battery will freeze and ruin the plates inside. A deep cycle battery could las 2-5 years depending on use. the worst thing that happens to them all is when we are hooked up to shore power in constantly charges which in time will ruin the battery.But there is not much we can do about that. The best thing to do is pull the battery and invest into one of the new trickle chargers "battery Tender" that will desulfate and keep battery 100& charged,then it shuts down to maintain battery. I have used them on my cars that I store and have good luck with my batteries since I started to use it.
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