Korea's Samsung Electronics has developed a docking station equipped
with a fuel cell capable of powering a laptop for a month. The dock
uses a Direct Methanol Fuel Cell with a maximum output of 20 watts.
Direct Methanol Fuel Cells(DMFCs) are best suited to producing small
amounts of power over a long periods at low temperatures, making them
well suited to mobile devices.
http://askwiki.blogspot.com/2006/12/samsungs-new-fuel-cell-capable-of.html
Worth Reading!!