Finally bit the bullet and factory reset last night. Current battery stats for today are below, note I have been messing around a lot with my phone today trying to get it setup correctly following the factory reset. Also note how Android System drain has gone from 36% to 6%!!:
View attachment 260351
I wouldn't celebrate just yet...
This version of Android reports battery usage differently than older ones.
What you're seeing is not the total percentage (what % of battery is being used) but rather think of it this way:
Your battery percentage is 59
You're missing 41
Of that 41, 6 has gone on Android System and 6 on Screen. NOT 6% of what is missing! Get it?
This means, when your battery drains further, this number will increase further.
To make an educated guess, your Android System is consuming 14.63% of your battery. (6 / 41 = 0.1463).
When your battery is almost empty, you will see the Android System drain at about 14% at least....
If you're lucky, that is!
Unfortunatelly, this could just be temporary, and it'll climb back up.
I don't know why they stupified the battery consumption percentages, but if you want better stats, one of the very best apps (IMHO) is System Panel 2.
You have to give it Usage Data Access and enable it in Accessibility, as well as use ADB to further enable it's monitoring abilities, but they've made this very easy - you just connect it to PC via USB and run their PC app, and suddenly the Android app can track exactly how much current an app or piece of hardware is using!
Here's a screenshot of mine.
I may be having more, than just one problem. In one of the attachments, the Android System battery consumption is absurd (28%). In another, 38.3% of total consumption is unaccounted for - the app can't determine what is draining the battery!
The third attachment shows the system's own battery consumption tracker, and "Android System" is at 31% with 10% of battery left to go. If I drained the battery to zero, "Android System" would have consumed 34%!
This is unacceptable, and the problem is obviously widespread. How could Samsung have overlooked something like that?