A group of MIT engineers have developed a new way of building lithium-ion batteries that could lead to smaller, lighter, and more efficient power packs. What’s really exciting is that these new li-ion batteries can charge in a matter of seconds rather than hours. We all use li-ion powered devices regularly. Cell phones, laptops, and even electronic cars can be powered by these types of batteries. Today’s li-ion batteries are pretty good at storing large amounts of power, but they’re also slow at gaining and