How Long Does a Smoke Detector Battery Last?

Significance

• Batteries power smoke detectors and allow them to detect smoke and warn building occupants of a possible fire. Replacing batteries when necessary represents a necessary household chore.

Replacement

• Most smoke detectors begin to beep or chirp when the battery starts to decline in function. This indicates a need to replace the battery immediately. Test smoke detectors monthly to ensure they function properly. Check with the manufacturer for specific recommendations on battery replacement intervals.

Considerations

• Use an alkaline battery if possible. Replace the batteries in all smoke detectors at the same time on a specific schedule; for instance, you can change all smoke detector batteries when the clocks change in the fall or spring. Batteries should be changed at least annually.