You are very close. It started up again today, and I was positioned just right to hear the source. Who would have thought the low battery alert on a smoke alarm would sound like a mouse trap.
First instinct was to shoot the gall darn thing, but I went ahead and did it the hard way. Seems they designed it to use those overpriced 9V
batteries. Not only that, it's a special 9V battery only available from a Kidde. If I ever see one in a store and happen to have a pocket full of money, I will consider buying one.