Researchers at the University of Tulsa have been awarded a patent for a method of making nanobatteries according to a new article in Nature. Their tiny 3.5v batteries are about one thousandth of a millimeter in size and put out one millionth of a milliamp. Other researchers trying to make nanoscopic batteries suggest the Tulsa group is premature in calling their creation a battery because they haven't figured out how to attach the wires to it that would be needed to use the power. For more information see the University of Tulsa press release.