Question about First Alert SA302 Dual System Smoke Detector

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I could not get to battery compartment of the first alert smoke alarm. Please tell me how to replace with new battery.

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Hold the entire smoke detector,turn it to the left or right,u will able to take the smoke detector out.The battery compartment is in the back.

Posted on Sep 09, 2010


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Posted on Jan 02, 2017


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How to get the battery out on a BRK first alert SC9120A.

First disconnect the smoke alarm from the AC power. You may need a flat blade screwdriver to separate the alarm unit from the mounting bracket. Position the screwdriver between the locking pin and the mounting bracket and turn both the smoke alarm and the screwdriver to the counterclockwise (to the left). If this pin isn't in place, you should just rotate the alarm counterclockwise to disengage it from the base. Next check if the battery compartment locking pin is in place. Use the flat blade screwdriver to pry the head of the locking pin out of the alarm. (It goes through the black dot on the label.)

If the lock is out, the battery compartment should pivot open when you press the lever. You'll want to press it so that it compresses against the battery compartment. For pictures to go with this explanation, see the manual. It's available here: .

I hope this helps.

Cindy Wells

Mar 14, 2018 | Home

1 Answer

Smoke alarm beeping and can't find a battery compartment, wired

Some smoke detectors don't have a battery compartment they are called 10 year smokes which never last that long. Take off the wiring harness sometimes there is a door there to access the battery compartment, if there is not compartment check the sides of the unit for a pull out latch. If none of those exist you will have to buy a whole new unit, I would recommend staying away from a 10 year and get something replaceable.

Jul 04, 2017 | Home

1 Answer

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See the instructions for that model. Sometimes you need to wait a minimum period of time between removal of the old battery and installation of the new one. Also make sure you are positioning the battery correctly; sometimes batteries can be put in backwards easily. It is also possible that the device is just bad and needs to be replaced.

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If the battery will not make a connection, it may not be installed properly. The connector requires firm pressure.

My First Alert instructions say to "press and hold the test button on the cover for 5-20 seconds, or until the alarm sounds".

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