Just browsed Digikey today to see what exciting new developments have occurred in the Ultracapacitor space. Looks like nearly all the Maxwell parts have been removed and nothing really exists in the very high capacity market anymore.
Then I Google it and learn that Tesla sold Maxwell's Ultracapacitor business back to the original owners that started UCAP to produce ultracaps.
https://electrek.co/2021/07/21/tesla...er-executives/
Disappointing that years later, this tech has not only not advanced, but has gotten worse as far as available products and pricing.