On my S24 Yktra, When I look at battery drain stats, the biggest offender is Google Play Services, which you cannot restrict background usage. ButJ suspect that is a lie, it's probably a system task not visible in the stats sceeen.
My S25 Ultra is draining battery so fast after this last update! I have to charge more than 3 times a day to keep over 30% battery. We need some fix right now!