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Message: <blockquote data-quote="airshot" data-source="post: 511671" data-attributes="member: 1183">Hmmm....mine stay charged for a month, above 90% anyway.  During long storage over winter I monitor them and when they drop down to 12.5 I put them on a maintainer for a couple weeks..  If I have one that drips more, I leave it on a maintainer for a month or more and brings them back to life.  My two deep cycle trolling batteries just dropped to 12.45 today, after sitting since Nov 15th. Topped up they usually read 12.8. My start battery has held 13.1 volts without any drop since Nov.Batteries were all new in 2019....still goin strong</blockquote>