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From stretchy bat wings to stretchy batteries

Researchers from Northwestern University and the University of Illinois have developed a lithium-ion battery that can be stretched to 300% of its original size and still function. Not quite as good as a bat wing (see below) but when compared to a standard, solid battery rather extraordinary. One suggested use is for implantation into the body where flat, rigid batteries would not be suitable.

Website link: Northwestern University elastic lithium-ion battery