The Deka Intimidator 9A31 AGM batteries (12v, 100ah @
C/20) in my Geo EV (www.austinev.org/evalbum/701)
have been emitting a noxious odor. The odor is strong
enough to encourage maintaining cross-ventilation in
the 14'x25' garage that the EV resides in. That's even
if the batts simply remain idle for a day and longer.
Its a chronic odor that increases on the discharge.
When driving, a 2" fan in the rear battery box pulls
some air thru the cabin, but its not enough.
There is one 3 amp output Soneil/ACI charger per
battery. The chargers are bringing the batts to
14.5v-14.7v then floating at 13.6, increasing to 13.9
if left plugged in for a few hours.
At 70-80F, Deka calls for charging to 14.3v-14.6v and
float of 13.4v-13.7v.
Perhaps the chargers are taking the batts a little
high now. But the batts were stinky thru the winter
since installation when if anything, the Soneils were
slightly undercharging the batteries.
So it is not obvious to me that overcharging is a
cause of the odor emissions.
A previous pack of different brand AGMs also emitted a
disagreeable odor. Perhaps a little stronger then the
One observation is that the intensity of the odor can
vary daily. I don't have a barometer handy yet and
wonder whether that variability is a result of battery
emissions varying with flucuations in barometric
Perhaps both battery packs simply have sealing valves
that are unable to maintain enough of a pressure
differential between the inside of the battery and the
outside barometric pressure.
I'd like to eliminate these battery emissions in the
near term. Suggestions?
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