Millenium Cell is a company that has been working on providing hydrogen based solutions for many things, including cars. Their sights have now targeted laptop computers. Though still in the development stage, a hydrogen cell for a laptop would be able to run for 12-14 hours per fill. I can foresee refueling points in airports and the like.
Hydrogen Laptop Battery
April 18th, 2005 
admin 
Posted in Power 
Sounds promising, as long as the whole refueling issue can be dealt with. Might get too expensive, though.