Here's an article that just came out regarding some scientists running batteries off of sugar. They are using enzymes from crabs to create fuel cells. There's nothing in production yet or anything of the sorts, but I thought I'd pass it on to everyone for future reference.
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The key ingredient making up the new device is the charge-stripping enzyme. The scientists incorporated this enzyme into membranes composed of chitosan, a commercial compound derived from crabs, shrimp and other crustaceans. These membranes are then integrated into fuel cells.
Minteer and her colleagues have developed a small prototype battery about the size of a postage stamp to successfully run a handheld calculator, findings they presented today at the American Chemical Society annual meeting in Chicago. They said the fuel cell could be ready for commercialization in three to five years.
So far the researchers have run the batteries on sap from trees and cacti, flat soda and sweetened drink mixes. They also tested fizzy sodas, but Minteer noted the carbonation appears to weaken the fuel cell. So far the best fuel source is simply ordinary table sugar dissolved in water.
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http://www.livescience.com/technology/070325_sugar_batteries.html
