Supercapacitor is an ambiguous term that just means "a capacitor with properties somewhere between a common capacitor and a battery". They've been a thing for a

Supercapacitor is an ambiguous term that just means "a capacitor with properties somewhere between a common capacitor and a battery". They've been a thing for a long time and they've been getting more and more "super" every year. They're just really expensive and only practical in highly specialized applications so you don't hear about them very often. Mouser and other distributors even have a category for them: https://www.mouser.com/Passive-Components/Capacitors/Supercapacitors-Ultracapacitors/_/N-5x76s https://www.mouser.com/Passive-Components/Capacitors/Superca... Sort by price descending to see some of the more interesting ones. The cheaper ones are still called supercapacitors but the delineation becomes a little meaningless at that range since regular capacitors have also improved significantly. Edit: fix link