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I'd say as long as you have a fully charged battery to start with and remove a battery cable to eliminate parasitic drain ... it should hang in there for several months. I think a self discharge rate of 4% per month is an accepted figure. However ... it just doesn't seem a big deal to me to remove the battery and store it in say the garage or shed with a battery tender hooked up over the winter. Your battery(s) will thank you over time.
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