Why do car batteries corrode?

Corrosion on the terminals is due to hydrogen gas being released from the acid in the battery. It mixes with other things in the atmosphere under the hood and produces the corrosion you see on the terminals. Generally, if the corrosion is occurring on the negative terminal, your system is probably undercharging. read more

While consumer alkaline batteries (such as the AA battery shown above) can leak and corrode while on the shelf, more likely are batteries that are left installed in devices. read more

Actually, you’d better take it out of your car so that the solution doesn’t get on any parts of the battery. White Corrosion on a Car Battery. White corrosion appears on the negative battery terminal. It occurs less often than the blue corrosion. It occurs on the car batteries of those cars that aren’t used for a long time. read more