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Old 05-23-2011, 11:06 AM   #1
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Marietta , Georgia
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AGM battery fumes?

I've read that the batteries we use inside of our trailers need to be vented to the outside. Does that also apply to AGM sealed batteries?


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Old 05-23-2011, 11:13 AM   #2
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No, But I would.

Just to be safe.

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Old 05-23-2011, 05:04 PM   #3
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the code does not make exception for AGMs

all lead acid batteries require a properly made box with ventilation.
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Old 05-23-2011, 05:53 PM   #4
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Years of use

I have used AGMs and not had a problem for 6 years in three trailers. No vents needed.
I'm NOT an old man.............
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Old 05-23-2011, 06:03 PM   #5
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If the pressure inside of an AGM gets too high because of excessive temperature and/or over charging, they can vent. It does not happen under normal use like a standard battery.


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Old 05-23-2011, 08:30 PM   #6
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i didn't think that containment and venting was needed with sealed batteries until i found an exploded battery in a computer UPS. it was swelled and split down a corner seam.
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Old 05-23-2011, 10:04 PM   #7
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AGM's are subject to sulfate crystal growth internally, similar to flooded cell batteries...

This expansion over time, due to overcharging, or sitting idle in a discharged state ultimately results in the swelling of the battery case and then splitting on the corner ends - something's got to give...

The expanded state of these batteries can be a real pain when they're installed in a tight-fitting steel case, such as a 'UPS' (Uninterruptible Power Supply)system - to remove them can take considerable EFFORT!

Charging at a higher than recommended voltage will cause the one way vent valves to emit fumes - not a normal concern if the charging equipment is paired properly with the AGM battery bank...When this happens, it's usually the end of the battery's useful life...
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Old 05-25-2011, 09:28 AM   #8
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Bryanl is 100% correct.

Randy 208-514-8950
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