My battery life dropped from approximetely 20 hours to less than 15 hours, how to find who is responsible?

My Samsung Galaxy S20 battery lifetime was up to 20 hours per one charge. The I have probably installed some apps, and the time is dropped to less than 15 hours. The phone is clearly warm during the day. It is definitely doing something. How to know what namely? GSam battery monitor told it can't determine power consumption on per application basis. Can I see processor usage or something? *** I gave permissions to GSam and it showed, that most consumption is from Android system itself. Can some application add module to the system, which consumes power? " class="img-fluid rounded" style="max-width: 100%; height: auto; margin: 10px 0;" loading="lazy"> " class="img-fluid rounded" style="max-width: 100%; height: auto; margin: 10px 0;" loading="lazy"> " class="img-fluid rounded" style="max-width: 100%; height: auto; margin: 10px 0;" loading="lazy">