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(ET) Carbon Monoxide While Charging?



Does anyone know whether batteries charging in the final gassing phase
produce Carbon Monoxide?  Last night while at the end of a charge with a
Lester automatic charger (finishing rate of about 45 volts and 7 amps) in a
large but closed garage, my CO detector went off and showed about 60 ppm.  
I
aired the place out and it went to zero.  Tried it again today and got a
repeat.  Is this truly CO, or are CO detectors sensitive to hydrogen?
Either way, a scary new aspect to charging in a closed environment.

Paul Heinzerling
Hudson, OH