Cerx I've changed the tags from General to Off-Topic as battery drainage is an incredibly subjective metric based on personal use cases, screen brightness, amount of touch interaction, signal level, cellular or wifi and so on and so forth for all the other variables.
If you can approach this a little more scientifically/objectively and provide a fully documented approach as to each days use and run down we can look at troubleshooting.
Happy to help assist but nothing in your post suggests an issue with the OS.