What is "lead sulfate"

alt. (context inorganic compound English) The insoluble lead salt or sulfuric acid, PbSO₄, that forms in lead-acid battery n. (context inorganic compound English) The insoluble lead salt or sulfuric acid, PbSO₄, that forms in lead-acid battery

Lead(II) sulfate (PbSO) is a white solid, which appears white in microcrystalline form. It is also known as fast white, milk white, sulfuric acid lead salt or anglesite.

It is often seen in the plates/electrodes of car batteries, as it is formed when the battery is discharged (when the battery is recharged, then the lead sulfate is transformed back to metallic lead and sulfuric acid on the negative terminal or lead dioxide and sulfuric acid on the positive terminal). Lead sulfate is poorly soluble in water.