No. This myth comes from two places. One, the cold of the concrete ruins the batteries storage ability. If that was true every battery would need replaced after every cold winter night. Two, the electricity leaks out of the battery because the concrete provides completed circuit. If that was true then why are batteries stored on metal shelves at part stores and car dealerships. Steel is a much better conductor than concrete.
No
Yes. It is a myth that a battery will run down sitting on concrete.
Car batteries do not usually corrode just sitting on concrete unless their is a leak in the container. I do know that you shouldn't place a car battery on a concrete surface as it can cause the battery to discharge its self into the concrete and you end up with a dead battery.
Yes
"Long ago, when battery cases were made out of natural rubber, this was true. Now, however, battery cases are made of polypropylene or other modern materials that allow a battery to be stored anywhere. A battery's rate of discharge is affected by its construction, its age, and the ambient temperature. The main issue with storing on concrete is that if the battery leaks, the concrete will be damaged." This was taken from the Trojan Batteries website
no you cannot kill your alternator by switching your battery from one car to another
Car battery charges can check the damage done to the actual battery but to the entire car is another story
The car will then be unable to start.
Putting a DVD player in your car will have a mild, but unsubstantial effect on your battery's voltage output.
You can short out a battery and destroy it in a few seconds.
No it will not, that is just a myth.
There is no fool proof way. Get a new battery if putting it on a slow charger does not work.