Ring · Smart home sensors
Ring Alarm Motion Detector (2nd Gen) battery
2 × 1.5V alkaline cell
Ring Alarm Motion Detector (2nd Gen) uses 2× AA. Do not copy the 1st Gen CR123A answer. Disarm Ring Alarm before opening the battery cover.
How to replace it
| How to open | Disarm Alarm. Slide device off mounting bracket (can stay mounted per Ring). Replace both AA cells matching +/-. Slide back onto bracket. |
|---|---|
| Orientation | Match +/- symbols |
| Low battery indicator | Low battery warning in Ring app |
| Access | Tool-free |
Important
- Generation: 2nd Gen uses 2× AA — not the same as 1st Gen 1× CR123A.
Sources
Helpful for this device
Optional tools for opening, testing or charging — separate from the battery answer.
- Panasonic eneloop AA (LSD NiMH)
Replacement AA cells when the device accepts NiMH
- Ansmann Energy Check LCD
Quick household cell check (good / low / replace)
- Battery tester
Quick good / low / dead check for household cells
New battery but still not working?
A fresh 2 × AA should restore Ring Alarm Motion Detector (2nd Gen) if the battery was the problem. Work through the checks below before replacing the device.
- Check orientation
Confirm the cell is seated correctly: Match +/- symbols
- Check the battery type
This device needs 2 × AA (alkaline). Rechargeable cells are only suitable when the manufacturer accepts that chemistry — set battery type in device settings if available. Same size does not always mean the same battery.
- Check known model-specific issues
Generation: 2nd Gen uses 2× AA — not the same as 1st Gen 1× CR123A.
- Confirm the battery itself
If you have a battery tester or multimeter, check the cell. A low open-circuit voltage often means replace; for rechargeable AA/AAA, a capacity test is more informative than voltage alone.
- 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.