Thanks to everybody for your input.
Our home was built in April 2007, so our CO detector (and a huge DUH from me with a red face....thank you for straightening me up on the chemistry I've forgotten....lack of sleep from the nighttime chirping..LOL!) is almost 5 years old. Perhaps it is at the end of it's life.
It's definitely the CO detector and not the smoke detectors...they have a different sound.
We noticed all the detectors are hard-wired, guess the low battery chirp is an additional safety precaution, ensuring you always have a fresh battery, in case you have a dangerous condition during a power outage.
Someone else (not on TOTV) told me the CO detectors require some kind of "special" 9 volt battery, but she wasn't sure what kind of special. Anyone out there ever hear of this?
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