Portable fuel cells
Ultracell offers 1-2 day operation of a laptop computer from a battery. How? It's a fuel cell that outputs 10-25 W of power; on a single fuel cartridge it can output 20 W for 24 hours. The methanol-solution filled cartridges are hot swappable, so it's ultimately an unlimited mobile power supply. Additional details are available on the spec sheet.
Obviously this isn't just for laptop computers. Anything that requires up to 25W can be powered, so that opens up a wide range of portable electronics possibilities.
Fuel cell technology may one day power all sorts of small devices, although the best bet at this time is a portable "generator" such as the Ultracell that can provide power to a a wide array of devices.
It's not available for purchase yet, but it's something to put on your shopping list.
Source: Gizmag.
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