We have a total of 6 smoke detectors in our home. They are
of the sort that has AC power to all of 'em, and each has a
9 volt battery "backup." All six are on the same AC circuit.
When one of them starts to "chirp" (indicating low battery),
we replace the batteries in all of them.
This is the drill:
I remove AC at the breaker. I remove batteries from all six
detectors. I press the "test" button on each (discharging
the internal capacitor, and generating a few feeble beeps.)
Then, I put new batteries in each. And finally, I turn on AC
at the breaker.
Here's the puzzle:
Right now, I have the AC power off, all six have had their
batteries removed, and all have had their test button pushed
Every few minutes, and apparently randomly, they are
I can't figure out where they are getting the energy to
generate the chirp sound.
Do these things photosynthesize?
In any case, I would welcome any thoughts on how this might
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