Does it hurt my car battery if I set it on concrete?

No, the type of plastic (polypropylene) used in battery cases today is a great electrical insulator, therefore cement causes no electrical discharge effect to the battery.

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  1. Comment #1 (Posted by Robert Ings )
    Concrete has 80 times the specific heat capacity of air, therefore, the bottom of the battery cools far more than the top area. Stratification of the electrolyte results from this temperature difference. This creates a charge imbalance on each plate, which causes the battery to self-discharge at much higher rate. Thermally insulate the battery from what ever suface you set it on to prevent discharge due to stratification.

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