What corrosion on a battery usually look like?

Corrosion on a battery typically appears as a white, ashy substance or a greenish-blue residue around the terminals. This buildup is often caused by the leakage of electrolyte, which reacts with the metal components. In lead-acid batteries, corrosion may appear as a crusty or powdery substance, while alkaline batteries may show a more powdery, white deposit. It's important to clean this corrosion promptly to ensure proper battery function and prevent damage.