Correct answer
Check electrolyte level and keep terminals clean, following manufacturer instructions.
Check the level according to the manufacturer’s instructions and keep terminals and connections clean. Replace normal water loss with distilled water, without adding acid or filling above the indicated level. Keep vents clear. Cleaning and externally protecting connections with the recommended product and procedure help prevent corrosion; do not confuse this with sulphation of internal plates. Do not open or top up a sealed battery.
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Cover vents with grease to prevent gas from escaping.
Add tap water without checking the specified level.
Check electrolyte level and keep terminals clean, following manufacturer instructions.
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