[Xiaomi Poco F3 / Xiaomi Mi 11X / Redmi K40] esszett:
I know that many of you are satisfied to get through the day with one battery charge because you use the device permanently. At night, the smartphone is connected to the charger and that's it. If you belong to exactly this group of users, you can save yourself the further reading ;)

Well, I am a bit different in this aspect. I sit in front of the PC for most of the day and use the smartphone comparatively rarely. I want to be reachable by phone, but I don't need to chat via Messenger all day. When I have time, I turn on WiFi or mobile data and retrieve messages manually. Generally, I only turn on all needed connections when I'm actively using them - the only exception is cellular for calls and text messages, that only gets turned off at night with flight mode. I also don't watch Netflix & Co via smartphone, in general I rather rarely watch videos on the smartphone. I also do not need to play games with the smartphone and if I do, then Sudoku or similar is enough for me ;) For all these applications I have a PC, large monitors and an even larger TV as screen. Sounds oldscool, and yeah, that's me ;)

I also have relatively few apps installed - only the ones I actually use. When possible, I use the mobile versions of websites rather than installing an app for them. This has the advantage that I only need one app for many things, and I need to keep it up-to-date: a browser.

In short: I am not interested in benchmark numbers of CPU/GPU. I need a reasonably good camera and a not too lame CPU for post-processing. In my free time, I am usually in the outback for several days/weeks without a power source (well, I have a small powerbank, of course), so a long runtime is mandatory. I want an enduring and reasonably smooth running phone that I don't have to charge every day or even every two or three days.

When I (not entirely voluntarily) switched from the F1 to the F3, I expected a lot because of the OLED screen and the larger battery. However, I had to realize that I have problems to even come close to the runtimes of my optimized F1.

I started logging the battery charges of the F1 purely out of interest.

A few relevant

averages

from 119 logged charges (in 787 days) are as follows:

Run time: 109 hours (so about 4.5 days).

SOT: 8 hours

Phone calls: 2.5 hours

I continued the log with the F3. The averages from 30 logged charges (in 111 days):

Run time: 62 hours (so just over 2.5 days).

SOT: 6.5 hours

Phone calls: 1.5 hours

Of course, AOD, pocket mode, DT2W, light sensor and all that stuff is disabled and I only use dark themes and 60 Hz. Just like on the F1, I don't use any Google services on the F3. Practically nothing changed in my usage behavior. However, the results are mighty disappointing...

I experimented a lot, other kernels, other ROMs, but it was practically the same/similarly bad everywhere. Now I'm running HavocOS with its own Kernel for the time being, because the idle consumption seemed to be lower than with other ROMs/Kernels. However, I made a few tweaks (all apps are available in the F-Droid Store):

1. Smartpack Kernel Manager: I lowered the boost clocks of the prime core and of the 3 main cores by a few 100 MHz.

2. Konabess: I undervolted the GPU and flashed the modified Kernel.

3. SuperFreeze: Most apps are frozen when the screen is locked. There are a few exceptions (Tidal, OsmAnd+, AntennaPod, etc.) that are allowed to run in the background until I force them to stop.

4. Autostart: I disabled the start triggers of almost all apps to keep closed apps closed.

Of course, my F3 does not break any benchmark records with this, but that is not my point. Everything still runs smoothly. With these things in place, I'm finally getting these averages from 3 charges:

Run time: 83 hours (so about 3,5 days)

SOT: 9 hours

Phone calls: 2 hours

That's still far from my original hope, but at least it's a significant increase. I very much hope that I have not yet reached the maximum.

TLDR

I would be interested to know if there are any people here at XDA who are similarly "passive". And if so, how satisfied they are with the F3 and/or what settings/tweaks they have made to achieve long runtimes

and

good SOT at the same time. I would be pleased about a few experiences and comparison values :)