If you're talking about long-term storage over the winter, there's no need to put good batteries on a charger over the winter. Batteries operate by chemical reaction. Chemical reactions slow down as temperatures decrease. They will not discharge significantly over the winter if they are good batteries, water is topped off, fully charged before storage, and then all the leads disconnected. (Also, disconnecting all the leads from the batteries gives you the incentive to clean them next spring before you reconnect.) Many of us, including me, store our boats in commercial areas where there is no power available to run a charger, with no ill effects. I live in central Minnesota, where winter temps commonly reach -20F and have never had any battery damage. Attached is 7 years' worth of voltage readings before and after storage on my boat.
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Ron.
Read your owner's manual.
2010 Alumacraft Classic 165
Yamaha 50 tiller
Minn Kota Terrova 12V
Humminbird 898, Helix 9
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