Maybe not a battery, but there was research at producing supercapacitors from virus capsids. http://news.bbc.co.uk/2/hi/science/nature/4782152.stm

> I wonder whether designer proteins could one day serve as a battery.

It occured to the Wachowskis too.

Is it just deja vu, or does someone make a comment like this every time an article is posted about organic batteries.

reminds of the battery from Rick and Morty ! wow

Watch out for prions!