I just use 4hours 6 minutes and the battery from from 100%to 18%, it's 120hz,but i am not playing games,just use some chat apps and watch YouTube. I watched many YouTube s20u test videos,others can use about 10hours for phone. And my phone just buy 4days, every time the battery life is less 6 hours,i turn off everything uncessary settings.
"We understand your concerns. The S20 series has an in-built AI battery manager which works to provide the best battery life by monitoring usage, however this typically takes 14 days to learn before it provides the best and most optimum battery performance. In the meantime we recommend closing down all app, as well as disabling features such as Wi-Fi and Mobile Data, when not in use. We apologise for any inconvenience this may cause you"