3-D batteries pack power into tiny footprints

Batteries might seem like they come in every shape and size that you can imagine. But as electronic devices become tinier and skinnier without reducing their power and energy demands, they challenge engineers to design batteries that can fit into smaller spaces without compromising on performance. Researchers have used non-traditional techniques to fashion one possible solution -- a powerful 3-D lithium ion battery with a footprint on the order of one hundred grains of salt.