Revision question · Band 2 traffic signs and signals, car control, pedestrians, mechanical knowledge

Following the manufacturer's instructions, what liquid is used to top up a serviceable lead-acid battery whose electrolyte is low?

Revision material from the imported DVSA bank includes source-checked Lanekind learning corrections. These corrections are not newly issued official examination questions, and practice does not reproduce a live test paper.

Answer options

Battery acid

Distilled water

Tap water

Diluted anti-freeze

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Distilled waterThis was the right answer

Only a serviceable battery with removable cell caps is topped up, using distilled or deionised water as its instructions specify. Sealed or maintenance-free batteries must not be opened. Wear suitable protection, avoid flames and sparks, and never add acid as a routine top-up.

Reviewed reading for this question

Maintain only a serviceable battery designed for topping upReviewed guidance summary · The distilled-water answer applies only to a maintainable battery and its manufacturer procedure.

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