Smoke alarm still chirping after a battery change
Short answer: Check that you used the exact battery type printed on the alarm, that it is fresh and fully seated with the door closed, and then press and hold the test button to clear the alarm, as many makers instruct. If it still chirps, look at the manufacture date on the back: smoke alarms should be replaced 10 years after that date, and many chirp at end of life.
Safety: Do not remove a battery to stop chirping and leave the alarm without power. If an alarm sounds continuously, treat it as a real alarm.
Step by step
- Find the chirping unit. Chirps echo, so stand under each alarm. Interconnected alarms can make it hard to tell.
- Use the right battery. Use the type printed on the alarm (often 9V, AA or a 3V lithium such as CR123A). Some makers say not to use rechargeable batteries.
- Seat it and close the door. Many alarms chirp if the battery door is not fully closed.
- Clear the alarm. Many makers say to press and hold the test button for several seconds after a battery change. Check your alarm's manual.
- Check the date. If the alarm is 10 or more years past its manufacture date, replace the whole alarm.
Alarm batteries
- Panasonic Platinum Power 6LF22XP-2B 9V Alkaline Button Top Batteries - 2-Pack Retail Card — $21.99
- Panasonic CR123A (12PK) 1550mAh 3V Lithium (LiMnO2) Button Top Photo Batteries - 12 Piece Retail Card — $45.99
- Panasonic CR123A (6PK) 1550mAh 3V Lithium (LiMnO2) Button Top Photo Batteries - 6 Piece Retail Card — $34.99
- Panasonic Alkaline Plus Power AA Batteries - 48 Count Box — $31.99
- Panasonic Industrial Alkaline 1.5V AA Battery - 24PK — $31.99
Common questions
Why does my smoke alarm chirp at night?
Homes usually cool at night, and a weak battery's voltage drops in the cold, so a low-battery chirp often starts in the early morning.
Can I use rechargeable batteries in a smoke alarm?
Many alarm makers say no. Follow the battery type listed on the alarm.
My alarm has a sealed battery. What now?
Sealed 10-year alarms cannot take a new battery. Replace the alarm at end of life.
Shop batteries Which battery does my alarm take?
Related categories: Batteries. General information only; follow the equipment maker's instructions and local codes. Updated 2026-11-14.