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Old 10-14-2013
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Re: Problem with new batteries keeping the charge

Even good wet-cell batteries will self discharge about 5-10%/month. Once you've completely charged you batteries, and they have "rested" for a few hours, their no-load voltage will be about 12.6V in a nice cool bilge. After a week or so that could easily dip down to 12.5V on you meter just from self discharge. If you want to keep them topped off, without leaving the boat plugged in, get a 20W solar panel and a charge controller.
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