I have the new Nuki pro which came with the built in battery pack. Before leaving for 3 week vacation, I had the 80% of battery. I thought its more than enough based on my old Nuki.
But,… I was wrong. Battery died on me mid vacation. When we came home, we couldn’t do anything, I had to drive to my sis an hour away for a spare key.
I have been using Nuki for some time now, but this new battery pack is just rubbish. Keep an eye on it if you are leaving for more then a week.
When there is a flaw in the programming, that the wifi module all the time connects to the wifi, and so for active the most time, drains much energy, what can get the battery empty very fast.