So i haven't had any issues with battery on my s21 ultra but i usually keep it on 60hz so its lasts me all day, (11hours SOT avg with 720p and location and Bluetooth off) because i am a heavy user, i tryed using 120hz one day and my phone was being excessively hot and lasted about 7hours 30mins SOT. Now i know the system optimizes battery life way more once you leave 120hz on, so i was wondering how long i should expect my battery to last.
i have reported the issue maybe software issue, or i will just get my phone checked out.
If you want a point of reference, I usually get anywhere from 6.5 to 7.5 SOT during a whole day and end around 10% battery. This usually includes about an hour or so of gaming, mostly genshin impact. This is with 1440p and 120hz adaptive, mostly wifi, no 5g.