[Moonman62]

a new battery-like device that could one day power small portable devices like mobile phones or laptops.

I wish I had a dollar for every time I've read that in an article.

[neverdem]

Reanimated ‘Junk’ DNA Is Found to Cause Disease

Risks: A Warning on Asthma and Acetaminophen

Strip Mines into Elk Habitat

Digital Devices Deprive Brain of Needed Downtime

FReepmail me if you want on or off my health and science ping list.

[AdmSmith]

On the other hand, the production of protons and electrons from complete oxidation of glucose potentially encompasses a lengthy biochemical chain which possibly may be implemented using sets of immobilized enzymes in the manner of mitochondrial respiration. (Mitochondrial power density is 0.1 - 1 MW/m3.)

http://www.nanomedicine.com/NMI/6.3.4.5.htm
The problem is that you can not scale it up to sufficient volumes.

The next problem relates to engineering: How is the packaging to be done, this article is a good introduction http://www.northeastern.edu/bionano/bio-pdfs/J%20N%20N%20%20%20%20Bio%20Fuel%20Cells%20and%20Bio%20Batteries.pdf