To update on this, things are even better on the Jan 2021 release. 10% lower battery, but this time 14h of YouTube music and nearly 4h screen on time. Seems like this is the version of the software the device should have launched with. Just make sure you turn off 5G unless you live in a 5G area. Seems to be a real battery hog otherwise.
I think the battery drain issue is a problem where the battery loses track of the actual charge that remains. I have been at 1% for over four hours doing everything normally and the phone hasnt shutoff. There should be a way to recalibrate the battery just like one can do with a notebook battery. I am leaving my phone on to see how long it will last at 1%.
My phone has been on 1% for well over 12 hours now. With normal usage. 120hz screen, no power savings but aod off. The battery charge tracking is completely off.
Update: so i let the phone run on 1% for well over 24 hours, with me playing music, streaming videos and using other apps. The phone died after 27 hours. When i tried to power on, it said 0% and showed a plug on the screen. I charged wirelessly for about 1.5 hours and then used the phone. It dropped down to 80% in like ten minutes, but then stabilized at 80%. I charged again to 100% and so far the battery is functioning normally now. Some how it lost track of the charge. But it seems fine now. There should be a way to "reset" the battery like what can be done on laptops when the chip that tracks amperes malfunctions