Other fast responders are supercapacitors, superconductor magnetic energy storage, flywheels, compressed air and there probably a lot more I don't know about.

Other fast responders are supercapacitors, superconductor magnetic energy storage, flywheels, compressed air and there probably a lot more I don't know about. What conventional chemical batteries have is mostly that they are manufactured in vast quantities, so the unit costs are constantly improving.