Ring · Smart home sensors
Ring Smoke & CO Listener battery
1 × 3V lithium cell
How to replace it
| How to open | Disarm Alarm. Turn lid counterclockwise and lift. Replace CR123A with +/- facing up. Align lid with open mark; turn clockwise until click. Test after replacement. |
|---|---|
| Orientation | Plus (+) and minus (-) symbols facing up |
| Low battery indicator | Low battery warning in Ring app |
| Notes | Can stay mounted during replacement. Test after battery change. |
| Access | Tool-free |
Sources
Helpful for this device
Optional tools for opening, testing or charging — separate from the battery answer.
- Fluke 101 Digital Multimeter
Accurate open-circuit voltage and basic electrical checks
- Klein Tools MM400 Multimeter
General DC voltage checks including battery terminals
- Digital multimeter
Measure open-circuit voltage and general electronics checks
New battery but still not working?
A fresh 1 × CR123A should restore Ring Smoke & CO Listener if the battery was the problem. Work through the checks below before replacing the device.
- Check orientation
Confirm the cell is seated correctly: Plus (+) and minus (-) symbols facing up
- Check the battery type
This device needs 1 × CR123A (lithium). Rechargeable cells are not supported for this device. Same size does not always mean the same battery.
- Confirm the battery itself
For most coin cells, fitting a known-good fresh cell of the correct code is simpler than capacity testing.
- Still not responding?
If a correct, fresh battery installed properly does not restore the device, the fault may be elsewhere — the device may need service or replacement.