Battery is being eaten


So my Nexus 9 battery is being eaten by something and I don`t know what...
My tab CPU seems to be awaken and not on deep sleep as it should.
Do you, guys, have any ideas ?


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Tablets don't go into deep sleep. It could be open applications in the background, a lot of syncing and updating occurring, or a variety of other problems. You'll have to be more specific. What does Battery Historian say?