Don batteries release explosive hydrogen gas?
There are only two conditions where this happens. One is if the battery pack is being worked very hard, especially when it is low on charge. The other is a normal occurence at the end of the charging cycle, as the batteries equalize their charges. Hydrogen is lighter than air. Given the opportunity, it quickly rises and dissipates. If batteries are enclosed in a box, ventilation to the outside should be provided. If they are simply in a rack under the hood, there is plenty of ventilation already. Most garages also have enough air leaks to avoid problems. It requires a very strong concentration of hydrogen in the air to reach explosive levels. You would be aware of an overwhelming battery acid smell long before that happened.
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