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Originally Posted by yvanleterrible
The main problem with them is hydrogen containment; there is a 10% loss per day of the gas permeating through the barrier in the best materials.
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I believe that the way that's being overcome is to store the fuel in an external tank, and only feed it to the cell as required. The demos I've seen of the notebook batteries have a separate fuel tank and a tiny mechanical pump which feeds the fuel (ethanol) into the cell as it's required.
Obviously, though, notebook batteries can be enormously larger than a Reader's battery. It'll probably be a long time before such things can be reduced in size sufficiently for something the size of the Reader.