Samsung a50s is the best selling device but , due to his battery proformance it has been very disappointing for us . Even I am charging my cell till 90% to 95% then also I am not getting much backup. Really very disappointed about this.
The only thing is that you have not optimised your settings Go to device care , battery , then put all google apps, facebook, messenger and other apps you want ,to sleep . Go to app info and restrict backroung usage. I am getting 5 hrs+ screen on time, which is more than enough for a 4000mah battery. i charge till 85 or 90 %
Galaxy A50s comes with 4000 mAh battery but typically under test conditons its only being rated as 3900 mAh. So 8 hrs screen on time continously is normal on a single charge. As battery backup depends upon various factors such as poor network coverage, excessive brightness, background running apps etc. So uninstall third party apps that you don't use often and turn on adaptive brightness so that your phone can adjust brightness according to your comfort. Although battery gets degraded after 3 to 4 years of usage and you may notice degraded battery performance.