Capacitors

In simple world, a capacitor stores energy and then releases it.

A supercapacitor is a capacitor that holds more energy.

What does a flex capacitor do... if it were real? Does it alternate amount of energy stored?

So if regular capacitor holds X and supercapacitor holds 2X... Flex Capacitor holds somewhere in between X and 2X? Does it hold.... between 0 and infinity?

If a capacitor could... hold infinity of energy.. or 1.21 gigawatts... could we use it for something useful?

EDIT: FLUX. Obviously.. .FLUX CAPACITOR