How often should smoke alarms be tested and batteries replaced?

• A. Test monthly; replace batteries at least annually (or per manufacturer guidance); replace detectors every 10 years
• B. Test quarterly; replace batteries every 5 years; replace detectors every 5 years
• C. Test weekly; replace batteries every 2 years; replace detectors every 15 years
• D. Test yearly; replace batteries every 3 years; replace detectors every 20 years

Answer: (A)

Regular smoke alarm maintenance centers on making sure the device will wake you up and alert you when there’s trouble. The best practice is to test the alarm every month to confirm it’s powered and will sound when you press its test button. Batteries should be replaced at least once a year (or per the manufacturer’s guidance) to keep the unit reliably powered. And the whole detector should be replaced about every 10 years because the sensors and electronics can degrade over time, reducing sensitivity and reliability. If you hear a chirp or the unit won’t pass a test, address it right away—replace the battery, and if the device is near the 10-year mark, replace the detector itself.