I’m a long time Nuki user and have owned a SL1, SL2 SL3P and now a SL4P. For most of the time I’m a happy users but I’m not too delighted about the SL4P. I kind of miss my SL3P.
The main issue I’m experiencing is erratic battery percentage and in general a battery drain. The percentage jumps up and down sometimes even with by 20%. Also the battery consumption seems extremely high compared to my previous Nuki’s. I dont have actual numbers but with my SL3P connected over MQTT I’m guessing I would at least get 3 months of usage and I never experience erratic battery levels being reported. Now with the SL4P I’m lucky if I get 3 weeks. Nothing has changed in my setup. Still the same WiFi network, stil connected to MQTT. I do experience an issue with the SL4P from time to time where the motor blocks when unlatching and the door can not be closed anymore without manual interaction. I dont think this is related to the erratic battery level and drain though as that happens even without these blockages.
The graph included below shows the erratic behaviour and battery drain. The only time I charged the battery was on the first of april (I kid you not). In the periode before that there was a lot of jumps and I after disconnecting the charger this morning the battery level was 100% till the evening and then within 4 houts it went from 100% to 89%. That’s 11%! And it keeps on draining, my guess is I will have to recharge within a day.
How to troubleshoot this behaviour and get more out of my Nuki battery.
Not sure if it’s related but when trying to create a battery report I’m getting an error that getting information about the device was not possible because it was unable to connect the device (I’m connected to the device over WiFi and Bluetooth while trying).
This is insane. Another 40% drop in 14 hours. The last spike is after pulling the battery pack in the hope that fixes the drain. But I do not even dare to leave the house without it also hooking up to a power bank, so the last 15 minutes of this graph it has been charging.
Update to 4.2.6 and check if the battery draining issue remains. Make sure that Battery saving is set to automatic (and not to fast).
If it remains, deactivate MQTT. If that still does not resolve it, join the beta program so that we get more logs and can have a more detailed view of what’s going on.
The jumpiness in battery percentage that you observe should mostly go away with the 4.2.6. Setting battery detection from automatic to Power Pack might help there too.
I wouldn’t call that a solution but a workaround. For now it seems updating to beta firmware 4.3.1 has solved the issue of the drain. It’s been 100% for a couple of days now. Then in itself is a little suspicious but I’ll see what the next value will be.
Next on the list is an issue with the SLP4 that when opening the door the motor blocks when it’s fully unlatched instead of returning to the unlocked position. It then can not be closed anymore without manual interaction. But I’ll post a seperate topic about that when I have further analysed it.
You are right, it’s a workaround and happy to have it it would be even better if I could disable the blinking of the recharging light that goes on and off while charging. Happily this happens only when charging so it’s not blinking all the time. I have also found a workaround for that one as you can see for the close-up pictures
Guess I jinxed it by posting this in the beta firmware thread. This is what happened yesterday without any real cause. I pulled the battery this morning (after which I always have to recalibrate as the motor will jam when opening the door after a full power cycle). Hopefully that will sort the issue again. I already followed up on other suggestions like:
updating to beta firmware 4.3.2
explicity setting the battery type to power pack
making sure it set tot automatic on battery saving
Adding to this thread. I own a Nuki Lock Pro 3.0. I use MQTT to connect it to my Home Assistant config. The other day it went completely flat and I had to charge the battery up. I left it plugged in all day. 3 days later I get a notification to say the battery is below 20%. Throughout today it’s been draining so quickly, it’s now at 13% and I need to charge it again.
My experience is relevant to the discussion. Regarding my problems I’ve been back and forth with support for the last couple weeks or so and to no result. My battery drains extremely quickly. This issue occurs regardless of the power pack or if I use my own AA batteries. If Wi-Fi is disabled, the battery doesn’t drain rapidly. The issue though is that even with WiFi enabled, this never used to happen. Something has changed either with Home Assistant, MQTT, or Nuki, and is now causing battery drain issues.
Had the same problem, supported sent me new power pack, installed with 83%, after less rhan 12 hours it is 58%,
I’m on the latest beta version,
Configuration of battery is manual - power pack, wifi with mqtt connected to home assistant
No, deco x60, less than 2 meter away from the access point, wifi super stable, using EMQX for MQTT broker, other than nuki disconnection and reconnection I don’t see any disconnecting clients, which I think the root cause of it,
Thinking about switching to Matter instead of MQTT to test it, one more thing I have identified - reconnection process is not smooth in terms of the Nuki, it tries many times up until it gets established, someyimes needs manually pressed on save button to reconnect (although at the same time other client are connected), I assume that process is not cheap in terms of battery
Updating after almost a week with Matters instead of MQTT over Wifi - No battery drain - started measuring at 53%, day after got to 52%, since then - no change
it would be even better if I could disable the blinking of the recharging light that goes on and off while charging. Happily this happens only when charging so it’s not blinking all the time. I have also found a workaround for that one as you can see for the close-up pictures 
