No one wants to realize once the inspector arrives or after their business has a fire that their panel is malfunctioning due to low or no battery life.
Fire alarm battery replacement.
Buy a new smoke detector.
A good rule of thumb is to change.
Replace the backup battery in a hard wire unit yearly whether it beeps or not.
If you have an ac hardwired interconnected alarm you will need to remove the quick connect wire harness from the back.
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Mark the date you changed your battery on the inside of the smoke alarm.