TL;DR – 9 month old Nuki lock failed due to power function malfunctioning, Nuki support knows about it, does nothing about it, offers a 15% discount code as compensation. Dear everyone, I have been a smart home user for more than 5 years. I have a solid setup of over 100 devices with solid connection and performance. About 2 years ago I decided to get smart locks and complete the HomeKit setup. I chose the Nuki products because they were reasonably priced, with generally favorable reviews and flaws I could live with. Unfortunately, one of the locks started showing signs of failure a few months after purchase. To my genuine surprise, customer service sent me a brand new, updated 3.0 Pro to replace a faulty 2.0 unit (still under warranty). The newly installed lock worked well for over 9 months. Unfortunately, last week it failed. Spectacular. In a cold winter weather with heavy snow, the lock simply did not work when I tried to open it via bluetooth or wifi (both Homekit and the official Nuki app). My partner and I had to wait 2 hours for a locksmith to literally break into our apartment (for a "casual" price of €150 due to the weather and time of day). The Nuki Smart Lock survived the procedure and I was able to restart the lock and began the investigation into this deeply unfortunate event. For some reason the battery died - and neither the lock itself (via the flashing LEDs) nor the app informed me of this problem. What was even more confusing is that when I removed the official power pack and placed it back in the lock, the app started showing 62% power remaining. Of course I escalated this with customer service. After a few emails sent, the customer representative explained that the fault could be the automatic detection of the "occasionally faulty" battery type, which, when broken, renders the lock unusable. To my genuine surprise, this was explained to me as a known (albeit sporadic) problem. This was confirmed when I saw that the app didn't recognize the power pack correctly (instead it shows "alkaline batteries". I seriously can't get my head around how Nuki knows about this critical issue with their smart home product, security level, and they don't inform anyone about it unless you report it. It really lowered my confidence in their devices and their supposed "quality oriented" reputation. I strongly advise you to reconsider using Nuki Smart Locks in your setup – and definitely have a spare key somewhere in case the magic fails. Bottom line: As compensation for this situation, Nuki gave me a 15% discount code for my next purchase 🤡. They ok looks like I'm definitely not going to use it Bottom line 2: PSA to all Nuki Power Pack users: turn off auto-detection of battery type within the app as it's clearly broken functionality and could cause a problem critical (from the user's point of view).