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I have yet to test this on the road but certainly for me 7+ hours of battery support was a big pull in moving to a Mac for business use. I have a 13" MBP, i.e., without the dedicated graphics: I think Apple were wise to fill this gap in the MBP line-up; I tried the 15" and it was frankly too big to lug around after my Vaio (although I marvel at the brutes who seem to manage it with ease), and got too hot and noisy if ever I switched to the separate graphics grunt. But the smaller MBP does both for the road and as a desktop replacement, for me.
I think I am in love (but don't take me too seriously :-)
On the luggability front, the battery life is enough to leave the charger behind on some day trips. (He says, having just realised I left my charger at home by accident today - and was fine.)
The only downside to the integrated battery with extended life, is: "What the heck do I do when there is a liquid spill on the keyboard?" (On other laptops my first act would be to remove the battery).
Worse case scenario you could always purchase an external battery from HyperMac:
http://www.hyperdrive.com/HyperMac-MacBook-External-Power-s/91.htm
If you grabbed the highest capacity battery you could have up to 20 hours of battery power 
It's a custom battery made for Apple. Probably the most controversial decision was to integrate the battery into the MBP. Hopefully replacement of the battery won't be outrageously expensive.
http://www.apple.com/macbookpro/battery/





purchasing stuff from America is incredibly expensive, and in some cases the shipping is hugely expensive 