I don't know that I've charged it fully since I got it. It was close to fully charged before I went to a wedding tonight. Lasted all 6 hours or so I was there, but was tuckering out (~20%) by the time I left. But I did spend a bit of time playing with the phone. And 4G was on the whole time. And I turned live wallpaper on, played with my weather and clock widgets, tried to get a wifi connection that wouldn't work, browsed the web a bit.
I recharged on the way home to about 50%, and sitting around playing with it for the last hour to 1.5 hours, it's still at 40%.
If it makes you feel any better, the biggest battery hog was the display, BY FAR. Like 80-something percent to the <20% combined for the other functions. I'll try and remember to post my impressions from my first "normal" day of use tomorrow and let you know how the battery fairs.