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Kidde i2040A Battery Replacement

Introduction

Smoke alarms are very important and a necessity to keep your home safe.

This guide will help you be able to replace the batteries easily.

That way for future beeps you won't sweat of the idea of completing this task.

Model of alarm used in guide: Kidde, i2040A

You will need:

  • 9V 6F22 Piscell battery

What you need

  1. Kidde i2040A Battery Replacement, Battery: step 1, image 1 of 2 Kidde i2040A Battery Replacement, Battery: step 1, image 2 of 2

    • Use a ladder to reach the smoke alarm.

    • Twist the alarm clockwise to unhook the smoke alarm from the ceiling.

    • The smoke alarm is still attached with a wiring harness.

    Edit

  2. Kidde i2040A Battery Replacement: step 2, image 1 of 2 Kidde i2040A Battery Replacement: step 2, image 2 of 2

    • Push down on the clips on each side of the wire to detach the alarm from the wire harness.

    • When the clips are pushed down, pull down to detach the wire.

    Edit

  3. Kidde i2040A Battery Replacement: step 3, image 1 of 3 Kidde i2040A Battery Replacement: step 3, image 2 of 3 Kidde i2040A Battery Replacement: step 3, image 3 of 3

    • Push the white button on the inside of the alarm to open the battery compartment.

    • Remove the battery from the compartment.

    • Replace with a new battery.

    Edit

  5. Kidde i2040A Battery Replacement: step 4, image 1 of 1

    • Close the battery compartment door.

    Edit

  6. Kidde i2040A Battery Replacement: step 5, image 1 of 3 Kidde i2040A Battery Replacement: step 5, image 2 of 3 Kidde i2040A Battery Replacement: step 5, image 3 of 3

    • Reconnect the wire to the alarm.

    Edit

  7. Kidde i2040A Battery Replacement: step 6, image 1 of 2 Kidde i2040A Battery Replacement: step 6, image 2 of 2

    • Align the alarm’s slots with the notches on the ceiling-mounted base.

    Edit

  8. Kidde i2040A Battery Replacement: step 7, image 1 of 1

    • When aligned, turn the alarm counterclockwise to lock it in place.

    • Confirm that the alarm won't fall off, and now you have completed the steps to replace a smoke alarm battery!

    Edit
Conclusion

When you have completed these steps, you will be able to replace future smoke alarm batteries on the whim!

You will also be able to educate friends or family on how to complete this task as well.

Author

with 1 other contributor

Alyze Escobedo

Member since: 09/24/25

145 Reputation

1 Guide authored

Badges: 2

Team

Austin Community College, Team 2-4, Tijerina Fall 2025 Member of Austin Community College, Team 2-4, Tijerina Fall 2025

AUSTINCC-TIJERINA-F25S2G4

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1 Guide authored

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