| just for shits and giggles, I measured the temp of my garage floor with my IR thermometer, and it read 77.5 degrees. The ambient air temp in my garage is 77 degrees according to the thermometer hanging on the wall. So, it appears that concrete isn't always cold. So much for your "cold surface (like concrete)" addendum. The myth I was referring to was in regard to the chemical interaction of the battery with the concrete resulting in discharge. The "theory" that you are referring to is that cold floor induced temperature gradients cause the battery to discharge is also questionable since flooded cell batteries have a natural tendency to self discharge on their own if they sit for too long. Plastic is a good thermal insulator, so any temperature gradient will likely be minor, if one exists at all. But, if you have the opportunity to place a battery on a cold floor and take temperature measurements, knock yourself out.
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