I'm surprised. And not all too happy. But apparently, my MacBook Pro will last about 4 hours max. Not at least 4 hours, but 4 hours max, while running on batteries. It looks like 2.5 to 3 hours with moderate usage. That is very sad. Apple's website says 4.5 hours for 15" MBPs and 6 hours for MacBooks. But I think I like my MacBook Pro more than the MacBooks - it's more powerful, and seeing how this will be my primary machine, I'd rather this be powerful enough to last me... more than 3 years? I hope?
Compared to my iBook G4's "at least 4 hours, if not 6 hours" (with a dim screen and low processor setting)... 3 hours is still pretty sad.