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Visonic NEXT K85 SMA Motion Sensor Battery Installation

Learn how to install or replace a battery in the Visonic NEXT K85 SMA Motion Sensor.

What You’ll Need
  • XFINITY Home
  • NEXT K85 SMA Motion Sensor
  • A Phillips-head screwdriver
  • One CR123A battery
  • Double-sided tape (optional)

How to Install the Battery

Before proceeding, please be sure that your system is disarmed. Working on devices while the system is armed can generate false alarms.

Did You Know? You may want to have some double-sided tape on hand if you need to remove your Sensor from the wall to install a battery. Use the tape to reattach your Sensor if the existing adhesive fails to hold it in place.

Do You Need A Battery? Make sure you have a battery before you proceed. Visit your nearest retail store that sells batteries or order your replacement battery kit from batteryjunction.com.

Call us at 1-800-XFINITY if you receive a low battery alert within 30 days of device installation.

Help Protect Our Environment: Please properly recycle your discarded batteries. For your convenience, batteries are accepted for recycling at various locations. Check www.call2recycle.org or call 1-800-8-Battery (1-800-8-228-8379) to find a recycling location near you.

Is This Your Sensor? Make sure that your Sensor looks like the one in the image below. If it does, you’re in the right place to find out how to install a battery in your Sensor.
The Visonic NEXT K85 SMA Motion Sensor from the front.
  1. Locate the screw on the bottom of the Sensor.
  2. Using a Phillips-head screwdriver, turn the screw counterclockwise until the cover is loose.
    Removing the screw in the bottom of the Sensor by turning a screwdriver counterclockwise.
  3. Gently pull the bottom of the cover away from the screw, then pull the top tab on the cover away from the slot in the top of the Sensor.
    .Pulling the top and bottom of the sensor apart and pulling the tab on the cover.

    Did You Know? The Motion Sensor and tamper are exposed once you remove the cover (shown below within the blue squares). Take care not to touch them. Repeated contact with the Sensor may compromise the functionality of your device and pressing down the tamper will default the Sensor.
  4. Remove the green circuit board by pushing forward on the catch and gently lifting the circuit board out of the Sensor body. The battery compartment is located on the back of the circuit board.
    Pushing down the catch and pushing up the green circuit board.

    Take a Look. If a battery is already present, remove it by using your fingertip to gently pull one end of the battery up until the battery is loose and you can pull it free from the slot.
  5. Insert one CR123A battery by aligning the positive (+) and negative (-) ends of the battery with the positive (+) and negative (-) indicators on the circuit board, then pressing the battery into the battery clasps.
    Pressing the battery into the clasps, making sure the positive and negative end align.
  6. When the battery is inserted correctly, the red light on the circuit board will illuminate.
    A red light glowing in the near-center of the circuit board.
  7. Position the circuit board against the stops at the bottom of the Sensor, making sure the battery is facing down.
  8. Gently press the battery end of the circuit board down until it snaps into place under the catch.
    Snapping the circuit board back into place.
  9. Slide the tab on the top of the cover into the slot at the top of the Motion Sensor.
  10. Press and hold the bottom of the cover against the Motion Sensor and use a Phillips-head screwdriver to turn the screw clockwise until tight.
    • If you're replacing the battery, confirm that the low battery alert has resolved and the Sensor appears on your list of connected devices in your Touchscreen Controller, Subscriber Portal or the XFINITY Home app for mobile devices.
    • Test the Sensor to confirm that it is working correctly.
      Reinstering the screw in the bottom of the sensor by turning a screwdriver clockwise.

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