I am absolutely beat, dealing with residential fire alarms at my house.

Upstairs, I have 4 alarms, all hard wired. I have replaced these alarms or batteries in the past.

This week, one started chirping, I replaced the battery, chirping, replaced the battery again, chirping, replaced the alarm, chirping, replaced alarm again.
Chirping.
Pulled the fire alarm amd removed it. Now the next door one just started Chirping. Removed it and the third started chirping. Now they are all removed upstairs.

I am going to check the quick connect wiring tomorrow morning when there is enough light to shut off the breaker. The suspect alarm has been replaced three times, I can only assume something is up with the wiring.

After that I'm gonna just burn the house down and start over.