Could be handy
The XPower PowerSource Mobile 100 from Xantrex Technology, available for $129 from xantrex.com and Amazon.com, is a rechargeable lithium-ion battery pack with a twist. Along with two sockets for U.S.B. cords, it has a standard AC outlet, eliminating the need to buy special adapter plugs to connect it to a laptop, P.D.A., cellphone or any other battery-operated product that uses no more than 100 watts.
Source: A Backup Battery for All Your Stuff, and Available in Midflight - New York Times
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