Kidde · Smoke & CO alarms
Kidde i9050 battery
1 × 9V alkaline
How to replace it
| How to open | Remove alarm from mounting plate if required. Open battery door, replace 9V matching polarity, close door, reinstall, and test. |
|---|---|
| Orientation | Match +/− on the compartment label |
| Low battery indicator | Chirp about every 30–40 seconds when low |
| Notes | Kidde product page: powered by a 9V battery. Current retail successor line is 20SDR (AA) — confirm your printed model before buying. |
| Access | Tool-free |
Important
- Life-safety device. Kidde i90xx family manuals for related models prohibit lithium 9V — use alkaline (or carbon-zinc where the manual allows) only as labelled.
- Kidde lists 20SDR as the replacement for this model — different battery (2× AA).
Sources
Helpful for this device
Optional tools for opening, testing or charging — separate from the battery answer.
- Ansmann Energy Check LCD
Quick household cell check (good / low / replace)
- ZTS Mini-MBT Multi-Battery Tester
More informative state-of-charge style checks across common formats
- Battery tester
Quick good / low / dead check for household cells
New battery but still not working?
A fresh 1 × 9V should restore Kidde i9050 if the battery was the problem. Work through the checks below before replacing the device.
- Check orientation
Confirm the cell is seated correctly: Match +/− on the compartment label
- Check the battery type
This device needs 1 × 9V (alkaline). Rechargeable cells are not supported for this device. Same size does not always mean the same battery.
- Check known model-specific issues
Life-safety device. Kidde i90xx family manuals for related models prohibit lithium 9V — use alkaline (or carbon-zinc where the manual allows) only as labelled. Kidde lists 20SDR as the replacement for this model — different battery (2× AA).
- 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.