Correct answer
Only distilled water.
Distilled water, following the manufacturer’s level and procedure, without adding acid or tap water. The electrolyte contains sulphuric acid and water; normal topping-up replaces water loss, not a leak of electrolyte or an initial fill. Do not open or top up sealed, AGM or gel batteries. Damage or leaks require inspection rather than simply adding water. Avoid overfilling and follow manufacturer precautions for acid and gases.
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Electrolyte and tap water.
Only sulphuric acid.
Only distilled water.
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