Correct answer
Suitable distilled or deionised water.
Suitable distilled or deionised water, following the manual without overfilling. Do not add oil, antifreeze or sulphuric acid to top up the level. Use manufacturer-specified protection and precautions. Do not open or refill sealed or maintenance-free batteries; consult a professional about damage, leaks or uncertainty.
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Water mixed with oil.
Water mixed with antifreeze.
Suitable distilled or deionised water.
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