Serious battery drain (Screen, Android OS) after JB upgrade
You are suffering the same problem I was after upgrading. Look in the direction of either Google Now or Google Maps. Good chance you have 'Report from this device' set in Maps Location Settings. This is murder on your battery! I disabled it and am now back at about 2% - 3% per hour on 3g with light use throughout the day. I also disabled Google Now for good measure, but I didn't notice any real improvements from that.

I do still notice much higher battery consumption than 4.04 when having wifi on. At home, I have reverted to 3G after seeing it burn through the battery at 5% per hour even without any active use.