You are checking the electrolyte level of the battery on a motor grader. You observe that one cell's electrolyte level is below the top of the plates, while the others are at the correct level. What should be done?

Question: You are checking the electrolyte level of the battery on a motor grader. You observe that one cell's electrolyte level is below the top of the plates, while the others are at the correct level. What should be done?

Answer options: ✅ Add distilled water to the low cell to cover the plates, then re-check all levels.

• Replace the entire battery, as one low cell indicates terminal failure.
• Top up all cells with battery acid to equalize the levels.
• Record the observation and operate the machine; it will likely self-correct with charging.

Correct answer: Add distilled water to the low cell to cover the plates, then re-check all levels.

Explanation: An electrolyte level below the plates can lead to plate damage and reduced battery performance or failure. Only distilled water should be added to lead-acid batteries to restore the level, as water is lost through evaporation during charging. Adding acid can over-concentrate the electrolyte. This is covered in IUOE operator training for heavy equipment maintenance.