Answer No carbon monoxide doesn't emit from charging a battery.
When batteries are being recharged, they generate hydrogen gas that is explosive in certain concentrations in air (explosive limits are 4.1 to 72 percent hydrogen in air). The ventilation system can exchange an adequate amount of fresh air for the number of batteries being charged. When i was working in SODEXO in Afghanistan. They left whole night to charge the batteries without proper ventilation. It crossed 100%,
a hydrogen gas explosion occurred in data center in the UPS room. It sustain signifcant damage.
In 2001 same explosion occured in california which damaged wall and UPS room.
CONTROL MEASURE
properly monitoring and ventilation properly.
The ventilation system should be designed to provide an adequate amount of fresh air for the number of batteries being charged. This level of ventilation is essential to prevent an explosion. Always keep sparks, flames, burning cigarettes, and other sources of ignition away from the battery recharging area...
2) Installation of Gas Detector (To identify and monitor the hydrogen gas level in the atmosphere)
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