This submarine drone is powered by a 20-meter-long fiber battery that is wrapped on its surface. Credit: Tural Khudiyev, Jung Tae Lee, Benjamin Grena, Yoel Fink et al =========================================================================== Researchers have developed a rechargeable lithium-ion battery in the form of an ultra-long fiber that could be woven into fabrics. The battery could enable a wide variety of wearable electronic devices, and might even be used to make 3D-printed batteries in virtually any shape. The researchers envision new possibilities for self-powered communications, sensing, and computational devices that could be worn like ordinary clothing, as well as devices whose batteries could also...