Smoke detector testing and battery schedule
Test every smoke alarm once a month. Replace 9-volt batteries (and backup batteries in hardwired alarms) at least once a year, and replace the whole alarm every 10 years. Sealed 10-year alarms don't need battery changes; replace them per the manufacturer.
Smoke detector testing and battery schedule
Checklist
- Press the test button on every alarmMonthly
- Replace batteries (an easy date: when the clocks change, Nov 1, 2026)Yearly
- Check the date on the back; replace alarms 10+ years oldYearly
- Test CO alarms the same dayMonthly
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| Alarm type | Test | Battery | Replace alarm |
|---|---|---|---|
| 9-volt battery | Monthly | At least yearly | Every 10 years |
| Hardwired with backup battery | Monthly | Backup at least yearly | Every 10 years |
| Sealed 10-year lithium | Monthly | Not replaceable | Per manufacturer |
The 10-year rule
Every smoke alarm has a manufacture date printed on the back. If it is more than 10 years old, replace it, even if the test button still works.
What you'll need
- 10-year sealed-battery smoke alarmNo yearly battery swap
- Combination smoke + CO alarmOne device for both
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Questions
How often should you test smoke detectors?
Once a month, according to the U.S. Fire Administration.
Why is my smoke detector chirping?
A chirp every minute or so usually means a low battery. In alarms near the end of their life, it can also mean the alarm needs replacing; check the date on the back.
Sources
Related guides
General guidance for typical homes. Follow your equipment manufacturer's instructions and local codes, and hire a pro for anything you're not comfortable doing.