In an open (serviceable) battery, what should be used to keep the electrolyte above the plates?

En español: En una batería abierta (con mantenimiento), ¿con qué se debe rellenar para mantener el electrolito por encima de las placas?

A Distilled water Correct answer
B Tap water
C Coolant
D Engine oil

Why this is the correct answer

In open batteries, the electrolyte must be kept above the lead plates by adding distilled water only.

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