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Friday, September 18th, 2026

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Best management practices for winterizing boat batteries

A properly stored battery, charged to capacity on a monthly basis, will almost always be as good in the spring as it was in the fall. (Photo by Mike Schoonveld)

There are dozens of opinions about how a boat battery should be treated in the offseason. Some say just top off the charge and pull the tarp on Ol’ Wavewacker.
“A fully charged battery is freeze-proof to about 90 below zero,” they say. “Even the U.P. doesn’t get that cold.”
Some people say, “Just hook a trickle charger to it and come back in the spring.” I’m sure it works for some, but certainly not for everyone.

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