Batteries can deteriorate and die if they go a long time without being charged.
Charge the batteries for your boat, motorcycle or riding lawn mower at least once a month in the off-season.
Another option is to hook them up to a battery maintainer. A battery maintainer won’t damage your battery like a trickle charger would.
A maintainer has smart monitoring circuitry that charges the battery only when it needs it.
Remove the battery and store it indoors if you live in an area with severely cold winters.
MYTH: Don’t store batteries on a concrete surface.
FACT: According to the folks at Interstate Battery, ‘Tremendous technological improvements have been made in the seals around the battery posts and vent systems, which have virtually eliminated electrolyte seepage and migration. So, it’s OK to set or store your battery on concrete.’