Smart locks
Yale Assure Lock 2 battery
4 × 1.5V alkaline cell
Yale Assure Lock 2 uses 4× AA alkaline batteries. Replace all four together. Battery identification only — no lock-bypass guidance.
How to replace it
| How to open | Open the interior battery cover and replace all four AA alkaline cells together. |
|---|---|
| Orientation | Match +/- markings in the battery tray |
| Low battery indicator | App and/or lock low-battery alerts |
| Notes | Yale product specs list 4× AA alkaline batteries included. |
| Access | Tool-free |
Important
- Yale product specs list 4× AA alkaline batteries included.
- Yale regional support recommends alkaline batteries for smart locks; do not invent chemistry allowances beyond OEM pages.
- Battery identification and manufacturer-supported replacement only — no lock-bypass guidance.
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 4 × AA should restore Yale Assure Lock 2 if the battery was the problem. Work through the checks below before replacing the device.
- Check orientation
Confirm the cell is seated correctly: Match +/- markings in the battery tray
- Check the battery type
This device needs 4 × AA (alkaline). Rechargeable cells are not supported for this device. Same size does not always mean the same battery.
- Check known model-specific issues
Yale product specs list 4× AA alkaline batteries included. Yale regional support recommends alkaline batteries for smart locks; do not invent chemistry allowances beyond OEM pages. Battery identification and manufacturer-supported replacement only — no lock-bypass guidance.
- 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.
Need to replace the device?
Yale Assure Lock 2 is still sold new. Only buy another if a fresh battery and the checks above did not help.