Need advice on my new s24.

So one month back I was confused between iphone 15 and s23. https://www.reddit.com/r/GadgetsIndia/s/1wNRmNzEQ3 I decided to go with iphone 15 and ordered it but later I thought, I should give myself more time and canceled it. After one month, yesterday, I bought this s24 for 68k. I haven't used it much but when I was switching data from old phone I noticed my m31 went from 31 to 28 while s24 went from 48 to 41 in the same time. Is the battery backup so bad? Also I need some advice to setup this phone to its max potential. Thank you and Happy Diwali🎇🎆