CO monitor
It is not a CO2 sensor, it is a CO sensor referred to as a Carbon Monoxide detector picking up gas in there unit like propane,
The monitor is hardwired to the battery and will drain it even when used.
I have a battery disconnect that cuts battery power to unit, so no drain.
Get rid of your detector and buy a gas detector from Home Depot that has a 10 year battery installed.
Hope this helps.
Picture of my battery disconnect from auto parts store.
Happy Trails
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