The shock from a car battery will not kill you. In fact, under normal conditions, a 12-volt car battery will usually not even shock you. Car batteries are not harmless, though. There are many ways you can be injured by car batteries:

The shock from a car battery will not harm you. Public Domain Image, source: Christopher S. Baird.Car battery acid can leak out of the battery and burn your skin.If a flame or spark is brought too close to a car battery with improper ventilation, hydrogen gas from the battery can explode, splashing battery fragments and acid all over your skin.Sparks (arcing) between a car battery terminal and other metal parts can cause the metal to get hot enough to burn you.If a car battery is short-circuited by a cable, the cable can heat up enough to catch fire.There are enough dangers present that it is a good idea to be cautious around car batteries and follow the maintenance instructions in the car's manual, even though electrocution by car battery is not going to happen.

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