Originally Posted by Hadron
What does the phone report is using the power? If that doesn't give you enough detail, install a battery monitor app like Gsam Battery Monitor which should help you identify the source of the drain.
Both the phone and that app report that the screen is causing all the battery drain, the few other things listed are using very minimal battery. But this is what I don't understand. The brightness is always either off or on auto. But again, I'm not using my phone much at all. How can the screen be sacking the battery so much when I don't even have it lit/unlocked the majority of the time? I've noticed if i turn off mobile data the battery percent doesn't move but i can't for the life of me figure out what must be running in the background to cause this.