I was wondering, how could I receive a notification before the battery in a Fob is empty? I just found https://nuki.io/de/hilfe/fob-de/f-funktionen/fob-signalisierung/
which says nothing about “low battery”.
So, is there a LED pattern if the CR1632 is low, or maybe an entry in the Nuki Smart Lock log? Even better, an email somewhere?