Battery

I'm not. How long have you had it for? Look in battery settings and see what apps might be running in the background. Some things that will determine battery, reception, background apps running.
 
No. My battery is good. I've gone from having to top up before the end of the day on my old phone to charging around every day and a half.
 
Mine usually gets light to medium use. I last charged mine 2.5 days ago and it is currently at 48%. No battery problem here (S21 Ultra).