This is my first post here, so pardon me for any mistakes.
I have an S9 (Not plus) with the Exynos SoC. I can easily get around 1 day 10 hours of battery life on it, with around 3-4 hours of SOT. I use it with LTE mobile data always on, use it as a mobile hotspot for around an hour or so each day, along with about 2-3 of hours of internet browsing (social media and stuff), music streaming, and also about an hour or so of gaming on it. Now, I've been getting this battery life since the July security update, before that it hardly went past 24 hours.
So a list of suggestions for Linus, as you are getting the same experience even from the Note 9, and not only the S9+:
Ensure that you are on the latest security update on the phones, especially the S9+.
If the S9 is on the latest update, try a factory reset (if you can) on the S9+.
Turn off AOD, if you don't actually require it. It takes up around 1-2% of battery every hour on the SD845, and even more on the Exynos 9810.
If you use Snapchat , uninstall it. It is an unoptimised piece of crap on Android.
Try using the mid power consumption mode in the battery optimiser settings, with CPU limiter off (CPU limiter doesn't actually save much battery, just a few minutes).
Clear your RAM, and put the apps to sleep in the Battery Optimiser menu (both are easily accessible via the Device Management Edge Panel) at regular intervals of time
Try a battery monitor app (sorry, but I have no clue about what apps to use) that can help you identify if there is some app/package that has been causing the drain.
If all of this fails, it is a high probability that your piece has some hardware defect/fault in it, causing it to overheat in your pocket, and drain your battery.
Also, it might be a possibility that your normal usage is extraordinary, as you said that this has been a persistent problem with you since a few years. In that case, I suggest that you divide workloads between 2 phones (seeing as you almost always carry 2 phones), so that the load is evenly distributed.
And as customary with anything you handle, Linus: Did you drop it? If you did, then there might be the cause of your problem.
I apologise if all of this seems harsh to you. Will be posting the same on the youtube comments section.
