In a battery that requires maintenance, if the electrolyte level is found to have dropped below the minimum, which liquid must be topped up?

Question

DentroTest · Accepted Answer

The electrolyte inside maintenance batteries is made up of a solution of sulfuric acid and distilled water. Because of normal operation and high temperatures, the water gradually evaporates over time, while the sulfuric acid does not evaporate and stays inside. For this reason, to restore the proper level (covering the lead plates by about one centimeter), only distilled water must be added. If more sulfuric acid were added, the chemical density would be adversely altered, damaging the plates, and if tap water were used, the minerals and impurities would cause internal short circuits and make the battery unusable.

In a battery that requires maintenance, if the electrolyte level is found to have dropped below the minimum, which liquid must be topped up?

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