Sony Japan has come up with batteries that can run on glucose. Pour in some grape juice or Gatorade and the 4-cell array can power speakers hooked up to a Walkman with only the addition of a small fan to produce an output of up to 50mW. Even if you can’t make out the translation, check out the demo of the prototype on their site, which pretty much speaks for itself. We were wondering what flavor the device would prefer and decided Fruit Punch sounds like it might be our best option.