I had to replace my batteries in my U100 lock today after 9 months (decent battery life) Upon doing so, however, the keypad and fingerprint sensor suddenly became sluggishly responsive. The app seems to work just fine still.
I attempted the calibration, but that seems to be only for the locking cylinder.
If I reset, do I have to re-enter all of the fingerprints and codes?
@432_38th_street Hey there!
Thanks for reaching out about your U100.
To answer your question directly: Yes, a factory reset will clear all saved fingerprints, passwords, and user data. You would need to re-enroll everything afterward.
Before going the reset route, here are a couple of quick checks for the sluggish keypad/fingerprint sensor after battery replacement:
- Ensure the new batteries are properly seated and making good contact
- Try removing and reinserting the batteries once more to refresh the connection
- Make sure you’re using high-quality alkaline batteries (avoid mixing old/new or different brands)
If you do need to reset the U100, keep in mind you’ll need either the admin password or fingerprint to complete the process. There’s also a convenient HomeKit code reset option if your lock is updated to version 3.0.0_0031 or later.
Since the app is still working fine, you might also try removing and re-adding the lock in the Aqara Home app as a softer troubleshooting step before a full factory reset.
Hope this helps get your lock back to snappy performance! Let us know how it goes. 

This information comes from community discussions and user experience summaries and may vary by environment. Please verify carefully.
I am using brand new Alkaline batteries
I have removed and reseated them twice to make sure it is correctly seated.
The keypad seemed to recover normal speed of function after sitting for a couple hours, but then has alternated back and forth to sluggish performance.