No. of Recommendations: 1
Finally got them all replaced. They are going on 12 years old. They say you should replace after 10. Turns out to be pretty simple. Three wire nuts in each one (line, neutral, interconnect). Just remove the old detector, remove its bracket (including the three wires going into wire nuts), put the new wires into the appropriate nuts, put the new bracket on, attach the detector. Took me less than 10 minutes each.

So far so good. No shrieking or chirping. Of course the old ones showed no signs of distress. But they were supposed to be changed, so I did it.

Now what to do with them. Pretty sure they don't want radioactive material in landfills. Granted, a tiny amount. But there likely is an approved disposal method.
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