Been watching several you tubes on super capacitors. Most videos are 8-9 years old. Posters are using them to make jump start boxes, and actually replacing the battery in their car with super capacitors. Maxwell, the leading manufacturer of them has been bought out by Elon Musk. They are used to quickly, as in instantly, recharge using energy from regenerative braking. You can connect a bank of super capacitors to a "dead battery" and it will charge up to enough voltage to crank car. Seems almost too good to be true, except you can now buy commercial super capacitor jump boxes. Some large trucks come with a set installed to help in cranking in cold weather, as they are unaffected by low temps, unlike lead acid batteries. Anybody here have any actual experience with super capacitors?