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Changing Your Motion Sensor's Battery

Written by Naomi Ramirez

Updated at August 20th, 2025

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Table of Contents

How to Replace Your Motion Sensor Battery

If you have received a Motion Sensor Low Battery notification on your Alarm Panel, you will need to replace the battery promptly to ensure the device continues to function properly. Information to order replacements can be found in our article, How to Order Replacement Batteries.

How to Replace Your Motion Sensor Battery

  1. Disarm your Alarm Panel before you begin this process
  2. Open the Motion Sensor by pressing in on the recessed tab at the bottom of the sensor and pulling the case toward you to remove the sensor from the base plate. (If there is a screw on the bottom of the sensor, please unscrew it.) 
  3. Pay close attention to the orientation of the (+) and (-) sides of the battery.
  4. Place the new CR123A battery in the sensor.
  5. Replace the sensor on the base plate
  6. To ensure that your Motion Sensor is functioning properly, press the tamper button on the side of the sensor to trigger a tamper. The alarm panel will report when a tamper has occurred. The tamper alert will clear on its own. 
motion sensor maintenance battery replacement

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Home Security
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  • Door Sensor
  • Window Sensor
  • Motion Detector
  • Glass Break Detector
  • Key Fob
  • Panic Button
  • Secondary Siren
Environmental Detectors
  • Environmental Detectors
  • Smoke Detector
  • Carbon Monoxide
  • Water Leak Detector
Cameras
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  • Eufy Indoor Camera
  • Eufy Outdoor Camera
  • Eufy Doorbell Camera
Services
  • Services
  • Cove Connect App
  • Professional Monitoring
  • RapidSOS
  • Professional Installation
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  • Reviews
  • Press Center
Help
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  • Contact Us
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