Are electric airplanes viable ? ?

A little over a year ago, Elon Musk waded into a Twitter conversation about electric aviation with the remark, “FWIW, based on calcs I did 10 years ago, cross-over point for Li-ion beating kerosene is ~400 Wh/kg. High cycle batteries are just 300 Wh/kg today, but probably exceed 400 in ~5 years.” This summer, he added: “400 Wh/kg *with* high cycle life, produced in volume (not just a lab) is not far. Probably 3 to 4 years.”

Electrovaya is closing the gap reporting in their latest presentation >350 Wh/Kg.  How much greater ?  Testing on the new solid state cell is still in it's early stages.   Stay tuned......

https://www.flightglobal.com/business-aviation/the-magic-number-that-makes-electric-flight-viable/140050.article