Just thought that I'd let everyone know that I'm getting 4 hours of battery life on a brand new macbook pro 17", 2010 model. i5 processor on integrated.... I am using it to surf at full brightness. There's no video. If there are any flash sites, they're limited to the ads that exist. I did not use a flash blocker.... Needless to say, in 2008 with my penryn mabook pro, albeit a 15 inch laptop, brand new under the same conditions I was getting maybe 3:45. This is a far cry from 9 hours. I am forcing the laptop to use integrated graphics. I'm not super impressed with the battery life and agree with macworld and engadget that the real world battery life is 4 - 4.5 hours, a full 50% less than Apple claims. I was expecting 5.5 under my current conditions. I believe that what's driving the battery life is the 95 wH battery itself, and there is nothing magical about the mac os x's operating system.