I updated to Sierra about 3 days ago I've started to notice my battery draining extremely fast and the fan turning on during times where it never has before. Even just sitting in class taking notes on my computer with nothing else running will now drain my battery and make my fan kick on extremely loudly. I had my battery up to 80% and this only lasted an hour for my class. I have checked to see if any apps are using significant energy and it says there aren't any. If anyone has suggestions i would appreciate it.