Boat Battery: Checkup and Storage

Whether or not your boat is stored for the season in a warm garage or out in the cold, your best bet is to remove all batteries and bring them inside.  A fully charged battery with a perfect electrolyte level can probably withstand temperatures down to zero degrees without freezing.  But the colder it gets, the more easily a battery can discharge, and therefore the more easily it can freeze at higher temps.  If even one of the cells freezes, the battery is shot!  Fully charge them about once a month over the winter and they will be ready when you are in the spring.  Try to keep them off of concrete floors is possible and cover the terminals to help prevent discharge.  The last thing you want is a dead battery on the launch ramp on opening day, or a dead trolling motor battery.