To replace batteries in models with rear loading batteries remove the alarm from the mounting plate by twisting it in the direction of the off arrow on the plate.
Fire alarm battery replacement.
Replace the backup battery in a hard wire unit yearly whether it beeps or not.
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Mark the date you changed your battery on the inside of the smoke alarm.
Buy a new smoke detector.
A good rule of thumb is to change.
Fire safety experts recommend you replace your smoke alarm battery two times a year.