Solid Power tested its high content silicon anode cells with a regimen of fast charging every fifth cycle, and found 81 percent capacity retention after 650 cycles. The company said fast charging every fifth cycle “is more in line with consumer behavior.” Solid Power also expects its lithium metal anode solid-state batteries to last 369,000 miles and more than 1000 cycles.

Solid Power said in an email that it is anticipating silicon EV cell production in 2025, with vehicles using those batteries coming out a year later in 2026.

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

Electrovaya says in their new presentation that after 300 cycles of testing battery cell capacity about 93% taken from graph.  Neither Quantum Scape or Solid power have released energy density numbers.  Electrovaya says highest energy density > 350W/Kg and that is preliminary.

The San Jose, California-based QuantumScape recently released data indicating that its battery cells with ceramic solid-electrolyte separators (made from what it said are “earth-abundant materials”) had gone through 400 cycles of 10 to 80 percent fast charging (the equivalent of covering 160,000 miles). And they retain, according to QuantumScape Chief Marketing Officer Asim Hussain, “well over 80 percent of their capacity at a variety of temperatures.” These temperatures ranged from 25 degrees Centigrade (77 degrees Fahrenheit) to 45 Centigrade (113 Fahrenheit), the company said.

So testing is not done the same either.  Looks to me Electrovaya has them beat !