Glad to find this thread. Can anyone confirm that the CO detector has a permanent battery or capacitor that will continue to provide enough power to produce the "beep" even after the 9 volt battery is removed? I was checking on the winterized coach the other day - propane, house batteries and all 9 volt batteries removed - and heard the weak "beep" coming from the coach. By the time I returned to the storage yard with a key, no more beeps, but found the brown cylindrical "thingy" on the CO circuit board. Looks about the size of a single AA.
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2017 Int'l Serenity 27FB
2020 F250 powered by converted solar
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