How To Replace Adt Motion Sensor Battery

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ADT motion sensors are an essential part of any home security system. They detect movement in designated areas and trigger an alarm if any unauthorized activity is detected. To ensure their smooth functioning, it is important to regularly replace the batteries in these motion sensors. This article will guide you through the process of replacing ADT motion sensor batteries in a few simple steps.

Step 1: Identify the Type of Battery

The first step is to identify the type of battery used in your ADT motion sensor. Most ADT motion sensors use either AA or AAA batteries. Refer to the user manual or check the existing battery to determine the correct battery type.

Step 2: Gather the Required Tools

Before beginning the battery replacement process, gather the necessary tools. You will typically need a small screwdriver (flathead or Phillips, depending on the model), a fresh set of batteries, and a clean cloth or tissue.

Step 3: Power Off the Sensor

Prior to replacing the battery, it is important to power off the ADT motion sensor to avoid any accidental triggering of the alarm. Locate the power switch or remove the sensor from the bracket, if applicable.

Step 4: Remove the Sensor Cover

Using the screwdriver, carefully remove the screws that secure the sensor cover. Place the screws in a safe place to prevent loss. Once the screws are removed, gently lift the cover to expose the battery compartment.

Step 5: Remove the Old Batteries

Take note of the position and orientation of the old batteries before removing them. This will help ensure the correct installation of the new batteries. Use the cloth or tissue to remove the old batteries, taking care not to damage the contacts in the battery compartment.

Step 6: Insert the New Batteries

Insert the new batteries into the compartment, following the correct polarity (+ and -) as indicated. Double-check that the batteries are securely in place and properly aligned.

Step 7: Replace the Sensor Cover

Once the new batteries are installed, carefully place the sensor cover back on and secure it with the screws. Ensure that the cover is aligned properly to avoid any gaps or loose fittings that could affect the sensor’s performance.

Step 8: Power On the Sensor

If you removed the sensor from the bracket in step 3, reattach it and switch on the power. If there was a power switch, turn it back on. The motion sensor should now be active and ready to detect any movement in its range.

Step 9: Test the Sensor

Test the motion sensor by moving within its detection range. If the sensor is working correctly, it should trigger the alarm or activate any connected devices, such as security cameras or lights. If there are any issues, double-check the battery installation and consult the user manual or ADT support for further troubleshooting.

Step 10: Regular Battery Maintenance

To ensure the continued functionality of your ADT motion sensor, make it a habit to check and replace the batteries regularly. Depending on usage, it is recommended to replace the batteries every 6 to 12 months, or as indicated by the manufacturer.


Replacing the battery in your ADT motion sensor is a simple process that can be done by following these steps. Regular battery maintenance is crucial to ensure the effectiveness of your home security system. By taking the time to replace the batteries as needed, you can have peace of mind knowing that your ADT motion sensor will continue to protect your home.