Batteries too low with 88% battery

Hi, I’ve replaced my Nuki batteries with 4 AA batteries (normal ones) and after like 3 weeks I can hear that the lock is behaving differently (the sound of the lock) and recently, sometimes when I try to unlock or lock it doesn’t do anything and I can hear a “click” sound. If I force multiple times eventually it will unlock/lock, but I suspect that this is a battery problem.

When I look into the logs I can see an error “battery too low” but the HomeKit app reports 88% battery life (which for 3 weeks doesn’t seem wrong).

The batteries are cheap, nevertheless, at least it should report correct % in the app to prevent this kind of surprises.

What can it be?

Hi! How much percent says the nuki app for the remaining accu load?

It says 82%