How To Store Boat Batteries Over The Winter. The good news is lithium-ion batteries hold a charge much longer than. If using a voltmeter a fully charged battery should read 125 volts.
If you need to you could store a battery on the boat during the winter as long as the battery is fully charged and hooked up to a reliable maintainer type charger. In this video Jason Halfen explains the best way to maintain. Some maintenance chargers have an auto shut-off and some.
To keep the batteries good over the winter I connected a battery tender maintainer.
If fully charged gel cell batteries can withstand temperatures as low as -25F without freezing and absorbed glass mat batteries can handle temperatures as low as -40F. Owners of AGM batteries will be especially interested in our in-depth look at how repeated incomplete charge cycles can reduce the batterys capacity. Allow all water to drain from the boat. The best way to keep from having to deal with dead or ruined batteries is to take them out of the boat.
