Battery water is used to replenish the water lost in lead-acid batteries due to evaporation and electrolysis. It is typically made up of distilled water, which has been treated to remove impurities, and a small amount of sulfuric acid. The sulfuric acid helps to protect the battery from corrosion and extend its life. The specific gravity of battery water is between 1.265 and 1.280.
The chemical formula for battery water is H2SO4.
