I had no idea ultracapacitors were only up to 5% of LION capacity. I thought they were already competitive. I heard superconductors can be used for energy sto

I had no idea ultracapacitors were only up to 5% of LION capacity. I thought they were already competitive. I heard superconductors can be used for energy storage. Assuming we had a room temperature superconductor, what would the power/density on that be? I.e., how would it compare to LION?