Many people have complained about poor battery and heating issues, the S20+ lasts longer without the refresh rate than this phone
No the S20+ also has 4500mah, and it lasts longer, the notes display is brighter than any other phone and they put a terrible battery in to compensate for that
have you reported via Samsung Members? report it using Samsung Members app -> Error reports
Have you tried sending your phone power mode to medium? Also, I use an app called kapersky battery life that will close background apps in try to help save your battery extended usage throughout the day.