I replaced my black Lumia 920 today with another black Lumia 920 from the same AT&T store. My original phone was dying too quickly. I had tried every battery fix on this forum with no luck. The first thing I did when I got in my car was reset the new one. I barely had time to charge it (maybe 45 minutes) after I bought before I had to run out to a meeting. Well, even on a barely-half battery, I've already had way better battery life than with my old phone when it was fully charged. Point is, you can try every fix under the sun or you can exchange it and hope you get one with a better battery. I'll update this thread in 24-48 hours after I've lived with the new phone for a day or so.