4. Streamlight CR123A Lithium Battery. Streamlight's CR123A battery is a popular option among security device users. It provides a high energy density, which translates to longer battery life and fewer replacements, perfect for your Vivint motion sensor.. Learn how to easily change the batteries in your Vivint Smart Lock with this step-by-step tutorial.In this video, we'll guide you through the process of repl.
 | Change Batteries/Smoke Detector (SMKT3) Change Batteries 02.jpg "Vivint Support")
CR123A batteries (x2) Disarm your system then remove the sensor from its mounting plate. Slide the sensor up to remove it. If your sensor has a screw at the bottom securing it to the mounting plate, please refer to Vivint Motion Sensor (PIR1) - Change Battery.. When your system's armed and you're away, any unexpected movement will sound an alarm and alert Vivint's 24/7 monitoring team. When you're at home, Vivint Motion Sensors communicate with your Smart Thermostat to adjust the temperature and keep you and your family comfortable. The Vivint Motion Sensor plays a vital role in your smart home, and that's why it's important to make sure to replace.