Tiny, Tiny Batteries

The revolutionary technology behind 3D-printed car parts, food and guns can also be used to print batteries smaller than a grain of sand. Scientists have used a 3D printer to make linthium-ion microbatteries that can fit into tiny devices that had previously stumped engineers looking to power them for longer periods. The batteries were constructed from interlaced stacks of tiny battery electrodes, which conduct electricity, that are each smaller than the width of a single human hair.