NanoComputer

Researchers from Rice University have developed paintable lithium-ion battery. Any surface can be painted with the new product,  and the batteries were easily charged with a small solar cell. Scientists foresee the possibility of integrating paintable batteries with recently reported paintable solar cells to create an energy-harvesting combination that would be hard to beat. 

"This means traditional packaging for batteries has given way to a much more flexible approach that allows all kinds of new design and integration possibilities for storage devices," said Ajayan, Rice's Benjamin M. and Mary Greenwood Anderson Professor in Mechanical Engineering and Materials Science. "There has been lot of interest in recent times in creating power sources with an improved form factor, and this is a big step forward in that direction."This rechargeable battery created in the lab of Rice consists of spray-painted layers, each representing the components in a traditional battery. 

Source: http://news.rice.edu/2012/06/28/rice-researchers-develop-paintable-battery-2/