Sony invents "biological" battery

It's already created test cells that can deliver 50mW, enough to play music on a flash device, said Sony.

Sony invented a cathod structure which adds oxygen to the elctrode and maintains the appropriate water control. This diagram explains the process:

The anode has sugar digesting enzymes and mediator and and a cathode with oxygen reducing enzymes and mediator, separated by cellophane.

The anode uses glucose dehyrdrogenase and diaphorase, the cathode bilirubin oxidase. The mediator for the anode is vitamin K3 and co-factor NADH, and potassium ferricyanide for the cathode, with the electrode made of porous carbon.

When we will see the sugar batteries in production? Sony didn't say. µ