Correct answer
Allow gases produced inside to escape.
To allow gases generated, especially during charging, to escape, preventing their accumulation and excessive pressure. They are not intended to drain electrolyte or prevent all gas exchange. This describes a conventional battery with vented caps, not an instruction to open any battery: do not open a sealed battery and always follow manufacturer instructions. Keep flames and sparks away.
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Automatically drain all electrolyte during charging.
Allow gases produced inside to escape.
Completely prevent any gas from escaping.
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