Battery life can vary dramatically between different use cases, but we have been riding this Nexus 7 pretty hard since we got our hands on it and the battery has held up quite well. While using the tablet for duties normally reserved for our phone — Google Voice messaging, browsing, email and the like — with a mixture of Wifi and Bluetooth tethered data and high (70-percent or above) screen brightness, we easily pushed past two days of usage with multiple hours of "screen on" time.
This falls in line with what we experienced on the original Nexus 7, and is more than acceptable for a tablet of this size. Even when using it as a primary device over a phone, the Nexus 7 battery held up very well to demanding usage. It's a great feeling being able to go to sleep at night and not even consider charging the tablet — knowing with a full day's use starting the next morning it still won't drain completely.