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the japanese paper-folding art origami hasinspired many kind of flexible batteries recently, but they won't actually stretch. but there is a need for stretchable batteriesthat can allow engineers to custom-fit batteries into moveable, flexible devices like a robot'slegs or a springy wristwatch band. now an arizona state university research teamhas overcome the limitation by using a variation of origami, called kirigami, as a design templatefor batteries that can be stretched to more than 150 percent of their original size andstill maintain full functionality. they developed kirigami-based lithium-ionbatteries using a combination of folds and cuts to create patterns that enable a significantincrease in stretchability. kirigami is a variation of origami that includescutting of the paper, rather than just folding the paper as is the case with origami. the kirigami-based prototype battery was fitinto an elastic wristband that was attached to a smart watch. the battery fully po...