Making sense of battery use...

[jamo]

So, I just got done watching Batman: Redhood and I was really pleased to see that my battery life only dropped 10%. That's really impressive, for a full-length movie. However, I can't understand my battery use report. Google Maps, which was never running, took up 2%, and there is no report of the video usage. I assume it was in the Display, but I thought the Gallery might have been listed. I had gps disabled, and never opened Google Maps, so what gives?