‎How to Replace Motion Sensor Gen 2 Battery | SimpliSafe Support Home

How to Replace Motion Sensor Gen 2 Battery


Are you receiving a low battery warning on your Motion Sensor Gen 2 shortly after installing the sensor?

If so, this may be related to a firmware issue rather than a low battery within the device.

The Motion Sensor Gen 2 takes a single CR-123A Lithium 3V battery and has a life expectancy of up to 4 years depending on placement and usage.

To change your Motion Sensor Gen 2 battery, slide the sensor up and off its bracket. Then, replace the battery and slide it back onto its bracket.

If your sensor is still offline after taking these steps, skip to the section below for troubleshooting steps.

Is your Motion Sensor Gen 2 offline after replacing the battery?

If the sensor does not come back online after changing the battery, it’s possible that your sensor has been offline for too long. The best step would be to remove the sensor from the SimpliSafe® Mobile App and then add it back to your system.

To remove your Motion Sensor Gen 2:

  1. Open the SimpliSafe® Mobile App on your phone or tablet

  2. Choose My System from the bottom navigation bar

  3. Select Device Settings

  4. Tap on the sensor you wish to remove

  5. Choose ‘Remove Device’

Once you have removed your sensor, you can add it back using our Installation Guide.