How can I see what in "Android System" is using my battery

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AC Question

I have a Samsung Galaxy S6 and use GSam Battery Monitor Pro. I have used Package Disabler Pro and my standby time is great. Overnight, I go down something like 4%. My screen on time is awful - GSam says average 2.5 hrs screen on time.

I see that Android System is using 10%-20% battery (Kernel another 7%). I'm wondering what service is actually using that. Is there a way to get that detail? Gsam show the services, but not how much time/cpu/battery they use.

Screen/WIFI are using most of the battery, not surprisingly.

Thanks
 
I don't think that you can see specific information on that