Actually yes and no. A auto battery setting motionless and staying
at a constant temperature can stratify the chemicals within and
harm the battery. What better way to do this than set it on a
very still vibration less hunk of concrete that will also hold a
fairly constant temperature.
It'supposed to be an "old wive's tale" but I never store batteries on
concrete. I've had them go bad stored that way in the past (ok - they
were rubber case tar-toppers, so it's a while ago) - but I always have
either a board or a plastic rack to store them on - can't hurt.
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