Do you guys think something like this would supply full power? Amazon.com: Energizer XP18000 Universal AC Adapter with External Battery for Laptops, Netbooks, and More: Computers & Accessories Obviously you lose some portability but if you're on an airplane you could just leave it in your bag and plug it in *edit* That one doesn't have an AC out. I think I would get one a little bit different with cord out so you can use the Lenovo 170w supply but I haven't seen any really 'portable' supplies that big. The battery from amazon supplies 66.5 W for it's max output. Perhaps that + the Lenovo battery can supply more juice for gaming?