https://news.yahoo.com/solid-state-ev-batteries-may-163900580.html

Sam Abuelsamid, principal research analyst at Guidehouse Insights, said in an interview about the solid-state battery claims, “It depends to some degree how you conduct the testing. What damages batteries during fast charging is heat, and if you’ve got one cell on a bench, fast charging and then discharging, you can control the temperature for that very well. So I’m not sure how representative that would be.”

Let us see how Electrovaya's new solid state battery stackes up against the ones mentioned in this atricle.  Just as soon as Electrovaya starts releasing test data.  That should be very interesting and telling !