E.g., presumably when you check battery usage stats each day, you'll get different percentages for the various apps displayed....except for Android OS which is always 9%? Do you use your device in very much the same way each day, or does it vary? Is the phone giving any other sort of trouble or is it just this 9% thing that you're wondering about? Has it always been like it, or is it something that developed recently?
(Just checked mine again, 17%.)
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