Battery Life
TDPs haven't changed, nor has the MacBook Pro's battery capacity, so overall battery life should (and does) remain relatively unchanged from the early 2011 models. Worst case scenario you can expect around 2.5 hours of battery life under load. With moderate load expect 4 - 5 hours of use on a single charge. And under a very light load you can easily exceed 7 hours.

I ran our normal battery life suite, however Lion has made some of the numbers a little less comparable than I would've liked. The lighter use cases (e.g. our web browsing tests) see a drop compared to our older Snow Leopard results. Under full load the new platform, even while running Lion, actually did a bit better than its predecessor. All in all I'd say the new MacBook Pro is pretty consistent with its predecessor - Lion just threw a wrench in a lot of our battery life comparisons so we'll be starting over from scratch in building our new database.