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Originally Posted by JFP in PA
Not necessary, particularly if you use a maintainer (like the OEM units) that plugs into the cigarette lighter……………
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My battery tender gets hot enough to melt the plastic casing if I leave the battery connected. Current draw can be too high for some maintainers. If you can figure out how to reset the clock, there's no benefit to leaving the battery connected unless you use the cigarette lighter maintainer, which then you have to stay connected of course.
It's actually safest to completely remove the battery from the car in case the maintainer or battery have problems while charging.