2oldman wrote:
ScottG wrote:
The ground is usually warmer than the air around it in the winter so folowing that logic, it's better to have them on the ground.
Yeah, I was thinking the same thing. Does a cold floor suck heat more than air of the same temperature?
Assuming that chart above is correct, it's moot anyway as the cold actually improves the battery's ability to retain a charge.
I remember that old wives tale quite well, since it was drummed into me many years ago, when I worked in a service station.
"NEVER set a battery on a CONCRETE floor! ALWAYS put a rubber mat, a board, or at least a piece of cardboard under it! The cold concrete will suck the charge right out of the battery!"
It was "common knowledge" in the 1940s and 1950s. IIRC, it has been debunked many times since then.
I hope the OP has had his batteries recharged and tested by now. Please let us know the results.