Here it would be "summerization" Winter is riding season here, all 4 months of it. I keep battery tenders on all my bikes, year round. When I go for a ride I unplug it, then plug it back in when I get back. My batteries now last a lot longer than they used to. I would not leave a flooded battery in the bike for very long just sitting there. Acid tends to leak out and cause corrosion. If you have one of those now, and plan to replace it with a MF battery next year, and don't plan to start the bike over the winter, I'd just toss the thing, then get a new battery next riding season.