What can cause corrosion on battery terminals?

Excess moisture and acid are the primary causes of corrosion on battery terminals. When moisture is present, combined with the acids often found in batteries, it creates a chemical reaction that leads to the formation of corrosion. This corrosion typically appears as a white, powdery substance around the terminals, which can inhibit electrical flow and ultimately affect the performance and longevity of the battery.

While high temperatures, improper installation, and the age of the battery can also contribute to various issues with batteries, they are not the direct causes of corrosion like excess moisture and acid are. High temperatures may accelerate the battery's internal processes or lead to leakage, while improper installation might create loose connections, and older batteries may be more susceptible to failure, but corrosion specifically results from the chemical reactions facilitated by moisture and acid exposure.