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CDifficulty 2/5

In a conventional lead-acid battery with vented caps, what is the function of these holes?

Correct answer

Allow gases produced inside to escape.

Allow gases that may be produced, particularly during charging, to escape, preventing accumulation and dangerous pressure build-up. They are not intended to expel excess electrolyte or increase battery voltage. This description concerns that battery design; other types use different venting systems or valves and must not be opened like a battery with service caps.

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  • Deliberately expel excess electrolyte to adjust the level.

  • Increase the electrical voltage delivered by the battery.

  • Allow gases produced inside to escape.

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