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Have you heard the ole wives tale (should be called ole mechanics tale since I don't think wives ever did this) of setting a battery on a block of wood so it wont go dead. LOL
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The old wives tale had some basis in fact when battery cases were bakelite - and tar tops. Slightly porous, the bakelite formed an ideal path for stray current when only slighty salted - and the tar tops with exposed bars only helped along.
And setting such a battery on a moisture laden concrete floor (ALL concrete connected to the ground contains moisture) only increased the current leakage.
Not to mention kept the battery cold when down near the floor - which as some have noted decreases the tendency to self discharge INTERNALLY - but worse decreases the available energy - at freezing about half the ampere-hour available as at 70F.
Today with heated garages and plastic cases not so much. Well, the floor is still a bit cold - which is why I usually keep the spare battery in the shop where the heat can be (not always - that thing called wood supply.)
Tom, I should shop your used battery store...
Joe K