Engineering · Electrical — Batteries
Lead-acid storage batteries must be kept in a well-ventilated space because charging produces:
- ACarbon monoxide
- BHydrogen gas, which is explosive✓ Correct
- CRefrigerant vapor
- DCarbon dioxide
Explanation
Charging electrolyzes water, liberating hydrogen and oxygen. Hydrogen is explosive in air, so battery rooms require ventilation and no sources of ignition.
Authority: Marine Electrical (USCG engineering topic)
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