Using simplex fire alarm replacement batteries for your fire alarm system panel is paramount to its operation during an emergency and can even lead you to trouble with code enforcement if overlooked.
Fire alarm battery replacement.
Buy a new smoke detector.
Fire safety experts recommend you replace your smoke alarm battery two times a year.
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Replace the backup battery in a hard wire unit yearly whether it beeps or not.
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.
If you have an ac hardwired interconnected alarm you will need to remove the quick connect wire harness from the back.