CWLee wrote:
I've ended up with an extra car battery. Took it to a local
auto parts store, to see if it was worth anything. The
clerk tested it and said it was "almost as good as new." He
said it showed 12.5 volts after a load dropped it to 11.5
and then it came back. He said it was in good shape. So,
maybe I should keep it. It is 5 years old, with a warranty
for 6 years. I told the clerk I'd just keep it in the
garage as a spare, and he said that was a good idea, but not
to let it sit on concrete. He said if it was stored on
concrete it would "drain away" to nothing within a couple of
weeks. I asked "What about placing it on wood?" He said he
didn't know about that, but for sure not to store it on
concrete.

Do any of you have any evidence to support his idea that
storing a good auto battery on a concrete floor would damage
it? In general, what is the best way/place to store an
unused but good auto battery?

You need a float charger.

http://www.harborfreight.com/cpi/cta...emnumber=42292