When I bought mine and fired it up I had a similar issue. I had read that battery was awsome but mine was draining at 10% an hour.... So, I checked every setting I could and the few culprits I found were these:
1) Google Now. It's crap in my country so I disabled it (the only thing that worked were weather notifications...and I have widgets for that). Why? It polls for your location CONSTANTLY. That's how it works its creepy magic.
2) After thinking about location polling, I went to Google Maps. For some reason after linking my account it decided to automatically link it to Latitude (which, does anyone use anymore?) and had the 'Location Reporting' to automatic. This was the 'rogue' app. After I turned that reporting thing off, the phone had stellar battery life.
Now I have a VERY hard time killing it after a day's work. I've managed to get nearly 8 hours of screen-on time and still get 20% left in my phone before going to bed. A W E S O M E.