Guess he didn't look very hard for the specs he's quoting. I had a Dell Dimension D430 which was awesome a few years ago (actually it was great until a few weeks ago when I dropped it) and got 6+ hours of battery life easily, and the Z-series Vaio I'm typing this on are just a teeny bit heavier than what he's talking about and also get similar battery life. Plus, for longer times without access to power outlets, there's always the second battery. Better to go from 5 to 10 hours by taking a second battery than going from 5 to 7 by adding extra weight that most of the time you don't use, imo.