Wait wait wait a second! Wright's law states, "when the cumulative production of a given thing doubles, its cost declines by a fixed amount." And, "Frith’s group puts the battery cost decline at 18% per production doubling at the pack level." But you say, "From 2015 to 2020, battery capacity grew 2.7 times" and correlate that with dropping battery pack prices. Did the "cumulative production" of EV battiers grow by 2.7 times? No, I think it grew much more than that. In fact, immediately after the Firth's group quote you say, "As an example, from 2010 to 2015, lithium-ion battery capacity doubled seven times, from 0.48 gigawatt-hours to 62 GWh." Now that sounds lik production capcity growing 128 times (doubling seven times) in 5 years, so how could it have grown only 2.7 times in the following 5 years? Especially considering that the first Gigafactory "began mass production of cells in January 2017" according to Wikipedia. So what grew 2.7 times? Perhaps you are thinking of the mileage range per charge for an EV, going from about 100 miles when I got my first Leaf in 2011 to many EVs having 250 to 300 mile range today? Methinks the entire basis of your article is a bunch of malarkey! Perhaps batteries are advancing according to LeVine's law, that correlates cost per kWhr with mileage range per full charge of an EV. You should publish this in the Journal of the Aeronatical Sciences, not Medium.