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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