Green Machine
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Overview
One Laptop Per Child is actually a project about the transformation of education. It's really about giving children who don't have the opportunity for learning that opportunity. So it's about access, it's about equity, and it's about giving the next generation of children in the developing world a bright and open future. - Walter Bender, OLPC President of Software and Content
Off Grid
... the typical laptop runs 20, 30, 40 watts, but when power is a real premium -- which it is for most of these kids and actually most schools even in the developed world -- we designed a laptop that runs on average two watts. So it brings it down within the realm of things like human-generated power, and solar. We have a very robust system for powering the laptop so that it will survive sort of a dirty 35-year-old truck engine generator ...
Power
The XO draws on average two watts off power and does not exceed fifteen watts. A typical PC laptop draws 20, 30, 40 or more watts, and a standard US incandenscent buld draws 60 watts.
The battery can be recharged in ## minutes, and can power the XO for ## minutes. The laptop can take a DC input ranging from 5 volts to 25 volts to charge the 5-cell NiMH battery inside. This is far more flexible than most portable devices. Polarity is positive (+) center pin and negative (-) outer. Reversing the connection will not harm the XO, but neither will it charge. The plug is 5.5mm x 1.75mm (5.5mm X 2.1mm is more common).
References
IBM developerWorks Interviews: Walter Bender on One Laptop Per Child - 24 Apr 2007