Newly created “micro-batteries” that are only a few millimeters in size are now the most powerful batteries in the world. The new batteries, created by researchers at the University of Illinois, greatly out-power “even the best supercapacitors,” while being only a fraction of their size. “The graphic illustrates a high power battery technology from the University of Illinois. Ions flow between three-dimensional micro-electrodes in a lithium ion battery.” “They pack such a punch that a driver could use a cellphone powered by these batteries to jump-start a dead car battery – and then recharge the phone in the blink of...