I slept at 6:00am with 98% battery and woke up at 10:30pm with 83% - I don't fuzz about my battery peformance too much but I've got tons of personal and work apps in my phone and I also leave it connected to the WiFi as I have WiFi Calling enabled (my network signal is weak inside the house). IMO the 15% drain after 16.5 hours is within acceptable parameters.
P.S. Hindi po ako batugan. Bumawi lang ako tulog today. LOL🤣
You still have un-closed apps thats why from 100% to 86% battery life. Ensure to closed all running apps to save your battery. Check if bluetooth or wifi connection is on.
