The original idea of having a human-powered generator in the laptop has been dropped as impracticable, but it's still necessary to have an alternative to mains or batteries. This is a sketch of a hand-held generator where power is produced by pulling the ring and the main body apart. A small girl can generate around 10 watts, a burly boy about 20-25W. As the OLPC takes 2W, this gives between 5 and 10 times the computing time as spent charging it.
Credit: © Rupert Goodwins/CNET Networks
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