MIT researchers have found a way to use viruses to create more "dense" batteries that can hold 2-3 times the amount of energy of a standard battery the same volume. These batteries can be as small as a grain of rice and will allow for further micronization of power supplies.
From MIT's press release.
"For the metal oxide we chose cobalt oxide because it has very good specific capacity, which will produce batteries with high energy density," meaning it can store two or three times more energy for its size and weight compared to previously used battery electrode materials. And adding the gold further increased the wires' energy density, she added.
So we know how people react to genetically modified foods, how bad will the reaction be to genetically engineered batteries? I hate to think of how you could even ship them between countries do to current biohazard laws and viral shipping restrictions.