iNstein t1_is3op8t wrote on October 13, 2022 at 1:47 AM

Reply to comment by RandomlyMethodical in NASA has invented a new type of high-performance battery that researchers claim could be used to power fully electric airplanes. by phife_is_a_dawg

I think they are referring to the power draw rather than the energy density. So it is possible they have a battery with a power density of 250wh/kg but are able to pull 500 watts from a 1kg battery for half an hour.