My father-in-law's generator ate batteries every year because it sat all summer and was dead by winter. We put a Battery Tender on the battery and the most recent one (also 12V 10Ah) has lasted three years so far. The Tender also has a plug you can wire directly onto the battery so you can plug it in without having to remove as much body work.
It's pretty much a given if you're storing it for winter, or only take lots of very short trips where the battery isn't getting charged enough.
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