A Ring Alarm Contact Sensor mounted on a sliding glass door inside of a modern home.

Replacing batteries in Ring Alarm devices

You will receive a “low battery” warning in the Ring app when it is time to replace the battery/batteries in your Ring Alarm device.

Replacing the Ring Alarm Contact Sensor batteries

Contact Sensor (2nd Gen)

Ring Alarm Contact Sensor (2nd Gen) uses two CR2032 batteries. To replace the batteries:

  1. Make sure your Ring Alarm is disarmed. ¹
  2. Remove the Contact Sensor by sliding it off of the mounting bracket.
  3. Remove the two batteries and insert new batteries.
  4. Slide the Contact Sensor back onto the mounting bracket until it clicks into place.
A Contact Sensor (2nd Generation) with an arrow showing it mounted half an inch from the wall and the cover sliding away from the wall with batteries.

Contact Sensor (1st Gen)

Ring Alarm Contact Sensor (1st Gen) uses a CR123A battery. To replace the battery:

  1. Make sure your Ring Alarm is disarmed. ¹
  2. Remove the cover from the device by pressing the cover release button and lifting the battery cover.
  3. Remove the CR123A battery.
  4. Insert the new battery (match +/- symbols).
  5. Replace the cover securely.
    Contact Sensor battery replacement diagram.

Outdoor Contact Sensor

Ring Outdoor Contact Sensor uses two AA batteries. To replace the batteries:

  1. Make sure your Ring Alarm is disarmed. ¹
  2. Remove the Contact Sensor by sliding it off of the mounting bracket.
  3. Remove the battery cover.
  4. Remove the two batteries and insert the new batteries (match +/- symbols).
  5. Replace the cover securely.
  6. Slide the Contact Sensor back onto the mounting bracket until it clicks into place.
Hands holding an Outdoor Contact Sensor with blue arrows indicating upward motion to remove battery. Line drawing of the battery compartment of the Outdoor Contact Sensor.

Replacing the Ring Alarm Motion Detector batteries

Motion Detector (2nd Gen)

The Motion Detector (2nd Gen) uses two AA batteries. To replace the batteries:

  1. Make sure your Ring Alarm is disarmed. ¹
  2. Slide the device off the mounting bracket.
  3. Remove the two batteries and insert the new batteries (match +/- symbols).
  4. Slide the device back onto the mounting bracket.
An arrow pointing up to show how to remove the back cover of the Motion Detector (2nd Generation) to replace the batteries.

The Motion Detector can stay mounted during replacement.

Motion Detector (1st Gen)

The Motion Detector (1st Gen) uses one CR123A battery. To replace the battery:

  1. Make sure your Ring Alarm is disarmed. ¹
  2. Remove the cover by pressing the top tab.
  3. Remove the battery and insert the new battery (match +/- symbols).
  4. Close the cover.
Illustration displaying how to remove the cover to replace the battery on a Ring Alarm Motion Detector (1st Gen).

Replacing the Ring Smoke & CO Listener battery

The Smoke and CO Listener uses a CR123A battery and can stay mounted during replacement. To replace the battery:

  1. Make sure your Ring Alarm is disarmed. ¹
  2. Turn the lid counterclockwise and lift to remove.
Smoke & CO Listener with a blue arrow circling clockwise, showing twisting the battery cover to remove it. Side view of Smoke and CO Listener with a space between the cover and the base showing the battery compartment inside.

3. Remove the old battery from the base and insert a new battery with the plus (+) and minus (-) symbols facing up.

Internal diagram of the Smoke and CO listener with battery terminals and components

4. Align the lid’s semicircle with the “open” mark.

5. Turn clockwise until it clicks.

6. Test your Ring Smoke & CO Listener after replacing the battery. Learn more about testing Ring Alarm Smoke & CO Listener.

Replacing the Ring Alarm Panic Button battery

Panic Button (2nd Gen)

Ring Alarm Panic Button (2nd Gen) uses two CR2032A batteries. To replace the batteries:

  1. Make sure your Ring Alarm is disarmed. ¹
  2. Remove the back cover from the device by twisting the lid counterclockwise until the top line moves to the unlock symbol.
  3. Use a small tool to remove the coin cell batteries.
  4. Insert two new batteries (match +/- symbols).
  5. Replace the cover, turning clockwise until it clicks.
The back of Panic Button (2nd Gen) showing two CR2032 batteries inserted with the plus side facing up and a QR code and a barcode above the batteries.

Panic Button (1st Gen)

Ring Alarm Panic Button (1st Gen) uses one CR123A battery. To replace the battery:

  1. Make sure your Ring Alarm is disarmed. ¹
  2. Remove the cover from the device by twisting the lid counterclockwise.
  3. Remove the CR123A battery.
  4. Insert the new battery (match +/- symbols).
  5. Replace the cover, turning clockwise until it clicks.
Illustration of a Panic Button with the cover lifted, showing the battery compartment and an arrow pointing left showing how to replace the cover.The inside of a Panic Button showing the battery at the top with the plus on the left and the minus on the right.

Replacing the Ring Alarm Flood & Freeze Sensor battery

The Flood and Freeze Sensor uses one CR123A battery. To replace the battery:

  1. Make sure your Ring Alarm is disarmed. ¹
  2. Remove the cover.
  3. Remove the CR123A battery.
  4. Insert the new battery (match +/- symbols).
  5. When the sensor is successfully paired, the LED will glow blue for three seconds.
  6. Align the lid’s semicircle with the “open” mark.
  7. Replace the cover, turning clockwise until it clicks.
Flood & Freeze Sensor with the cover off showing the inside with a battery on the left in the compartment and a blue line pointing to it.

Replacing the Ring Alarm Glass Break Sensor battery

If you get a "low battery" notification in the app, it's time to replace the battery. To replace the battery on your Glass Break Sensor:

  1. Make sure your Ring Alarm is disarmed. ¹
  2. Twist off the back cover.
  3. Remove the old AA batteries.
  4. Insert the new battery (match +/- symbols).
  5. Close the cover by twisting until the lock arrow points toward the lock symbol.
The back of Glass Break Sensor with the cover removed showing AA batteries arranged in a triangle with a QR code visible in the center.

Last updated 1 month ago

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    ¹Ring Alarm and all Ring Alarm accessories require a compatible Ring subscription (sold separately) for digital arming/disarming and certain other in-app features.
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