It's average. I carry a spare in my car for days of heavy use.
I use my phone over wifi at work from 8-5pm, and upon leaving work it is usually at 60-70% remaining.
If you use Google Maps a lot, the battery life is cut in half. I do like the Ultra Power Saving mode though. It only allows for phone/text, but at least it extends the battery life by several hours when below 15%.