How is the operating system able to know the battery level?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Puzzle Game Looping

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Chapters
00:00 Question
00:24 Accepted answer (Score 33)
03:04 Answer 2 (Score 59)
03:49 Answer 3 (Score 2)
05:30 Thank you

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Full question
https://superuser.com/questions/1364105/...

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Tags
#battery #operatingsystems

#avk47