Also note that the there difference is going to be hardly 5-7%. If you want to save more battery and dont play games, enable power saving mode which will restrict CPU usage and conserve more battery and when You have to play game, change the settings.
Dark mode don't drain more battery. Cause the type of display Samsung use in smartphones are Amoled display which is also a oled panel but the quality is high relative to normal oled panel. But the display itself use back-light to emit itself so in dark mode it glow where the display needs to be. Less battery consumption.
then enable maximum power saving mode. if and when you need to do multi tasking, you can change to settings to balanced/adaptive and revert when you are done. there are quite a few things that you can do to save battery further. like reduce animations and stuff. let me know if you want to know the details.
go to settings>about phone>software and click build number 7 times and you will be given developer rights. go back to settings and you will see a new option called Developer Options. click that and scroll down to see windows animation scale, transition animation scale and animation duration. change the scale to Zero or 0.5 Whatever you prefer. if you want fast animations then .5 and if no animations then 0. i personally prefer 0.5 because it looks good but if battery is of utmost importance to you then 0
