Yup, John got it, I would bet on that. My End of Life signal came at a dock on the first afternoon of a 7 day cruise. The guy behind me had his generator on the dock, running, and the breeze was blowing from me towards him. Could not stop the beep. Tried 2 sets of new batteries. Even after the gen was off for half an hour, all my windows were open, the back door and a fan running. Finally another boater came over and offered the EOL concept. Took the batteries out and did the trip with no CO detector. (Sorry John, no AmazingOne Prime delivery in the Gulf Islands :disgust then.
Harvey
SleepyC :moon