How to Change a Smoke Detector Battery

Home Maintenance Guides

Regularly checking and replacing your smoke detectors' batteries will make sure they are working in an emergency.

Tool's needed Optional tools Task Details
9-volt batteries Step Ladder Est time: less than 30 min
Cost: $1 - 2 per battery
People needed: 1

Step 1

Identify the location of all the smoke detectors in your house and make a plan for the order in which we'll check their batteries. We want to make sure we don't accidentally forget to check one.

Step 2

Remove old batteries from the smoke detector and insert new ones.

Step 3

Test to see that the smoke detector is working properly. To do so, stand up to four feet away from the smoke detector and spray it for 3 seconds. If the smoke detector alarm sounds your smoke detector is working properly. If your smoke detector has a test feature, use that to check if it is working properly!

Step 4

Change batteries again after 6 months or if smoke detector starts to beep or chirp.

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