How to change the battery in an ADT window or door sensor

In this article, I show how to change the battery in an ADT window or door sensor.

As most ADT devices use batteries, it's necessary to replace them from time to time to keep everything working and protect your house or office.

The sensors work with a 3V CR123A Lithium battery you can buy online.

The process is straightforward and takes less than 5 minutes.

The time to replace the window/door sensors

The question is, "How do I know when to replace the ADT sensor battery?"

The answer is simple; you can see the indicators on the keypad or in the smartphone App.

Things you need to change the battery

To change the battery in an ADT window or door sensor is necessary to remove its cover, so you need some tools to get the job done.

Here is what you need:

  • Door/window sensor;
  • 3 Volt battery;
  • Flathead screwdriver.
  • Now that you have everything let's get started.

    Put the system on test mode

    Before replacing the ADT sensor battery, you need to put the system in test mode.

    Here are the steps:

  • Visit;
  • Click on “My Alarm” in the dashboard;
  • Select "System Management";
  • Select “Test System”;
  • Change it to "Test mode".
  • How to change the battery in the ADT sensor

  • Put the system on test mode;
  • Press on the tab located at the top of the sensor;
  • Remove the sensor cover;
  • Replace the battery with a new one;
  • Close the sensor.
  • ADT windows sensor battery

    And it's done. Pretty easy, huh?

    Make sure to check if the battery polarity is correct when inserting it into place.

    After replacing the battery, go to the ADT dashboard to remove the test mode.

    I hope this article can help you; please share it with your friends.

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