Paint-on lithium-ion battery can be applied to virtually any surface by Rice University

“Researchers at Rice University have developed a lithium-ion battery that can be painted on virtually any surface.
The rechargeable battery created in the lab of Rice materials scientist Pulickel Ajayan consists of spray-painted layers, each representing the components in a traditional battery.”
more info @ http://news.rice.edu/2012/06/28/rice-researchers-develop-paintable-battery-2/