Got woken up early by chirp chirp chirp chirp chirp …………..chirp chirp chirp.
So I turned over, till wife did her version that was more annoying than the smoke detector.

Change battery, still chirped, another battery, still chirped. All new batteries dated 2025 and good on the tongue test.
Now my detectors are AC powered, battery backup, all levels of house tied together.
So checked 1st floor, battery dead on the tongue test, so new battery. Still chirping upstairs.
So checked basement, battery dead on tongue test, still chirping upstairs.
Went to garage where I have a brand new detector like the upstairs one. Instructions say, after replacing battery, perform a test. Ok, tested upstairs unit.
Chirp coming from down the hall. Carbon monoxide detector chirping. New batteries, still chirping. Same thing happened last week to downstairs one. Apparently both have expired and needs replaced.
Drove to Ohio with trailer. Installed new washing machine shutoff valves for dad, loaded my old husqvarna mower on trailer. Dad had really beat it up, the front grill was bent sideways and was against tire. I had to beat it with sledge to get tire to turn.
How he did this, I can only guess he doesn’t know.
Sitting outside, talking to dad when wife calls. Smoke detector chirping again. I had them get the new one from garage and swap. No more calls.