I agree that the oem extended battery was pathetic in how much extra juice it offered. I had to jump to a 3rd party extended battery from amazon. I ended up using a 3800mAh battery from hyperion, and that made a world of difference. That gives almost 2000extra mAh effectively doubling capacity from the original battery. With that, I had no problem getting through the day often with 4.5-6 hours of screen time depending how much of it was on wifi versus lte.
Of course, that is pretty much what I average now with my Nexus 4 and it's non removable 2100mAh battery. Just goes to show you how much better things have gotten tech wise.
I ended up doing the same thing with the Hyperion battery. The only negative with that was it made the phone much bulkier than I would've liked. I only tolerated it because I didn't want to continue carrying around an extra battery.