i was thinking about one thing... to charge a 1f capacitor you take 1 amp for one second and it will raise the voltage to 1v... this accumulate 0.5j of energy
if you have a coil for example and charge it with current this current is forced to go out independently when you open the switch...
if you have other coils operating cooperatively to maintain a voltage level across the cell this independent coils can be charged and discharged in a sequence to make the better use of energy
if we charge a 1uh coil with 100 amps it has 5mj of energy but will discharge much faster..
maybe we could make it collapse slower? like slowing down a magnet inside a copper tube?