Home Smoke detectors are all Beeping Batteries are not dead.???

[camerart]

And non-rechargeables last 5+ years

Hi N,
I checked my re-chargeable batts and they are 4 years old, let's see
C

 

[ahsrabrifat]

Smoke detectors generally expire after 8–10 years. Check the manufacture date printed on the back of each unit. If they’re 10+ years old, consider replacing them.

 

[be80be]

The yellow wire connects them all together so one beeps they all beep . Its very common to be powered from mains
and have backup power most places its code.

And the 0ne beep is low battery one somewhere is low maybe where inside heat unit or basement room lot of times you miss one like that