have done these too. but there is no change. mainly why should i change to flight mode at night. thats wrong. i change to medium power saving mode when the phoen hits 50 %
I had same issue with my Note9 too then I tried Restricting Background battery usage for Certain Apps. & Now I managed to go for whole day, if you haven't tried this then go for it..Might be your issue resolved. But Choose these apps for battery restriction Carefully & as per your Priority, System Apps need not to be disturbed....
Actual reason is advik (the post belongs to) not Satisfied with his handset, nothing more,,, Me posted here verious methods to Increase battery life, Still he saying "I tried" it, "I tried it"😊
....100k Rs iPhone lasts only 5 -6hrs of regular use(Me using both Note 9 and I phone X)
