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As I understand it, the CO sensor works off the 12V system. The smoke detectors operate from an internal 9V battery and possibly the 120V AC. When I winterized my rig, I pulled the 9V battery from the smoke detector and I disconnected my 12V battery completely.
I do know that when the 12V battery goes flat, or after it has been disconnected, it takes a few minutes for the CO detector to come back online. But without power, neither of the sensors will trigger.
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