What's fishy about it?
I've only used it connected to the wall so far, my co-worker had his running for 3.5 hours and the forum thread linked in the bottom of the article has lots of people running it for 3.5 to 4 hours. I just haven't had a change to test the battery that well yet.
Also, "I was imagining myself taking 10 hour+ flights" was a joke as I figured I wouldn't need that much battery so I let go of that requirement.