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So this is the idea:

(taken from Iron man, i suppose)

- The idea is making a superconductor into a ring,
and then charging it using a coil...
once it is charged,
you can remove the coil,
and you have stored electricity in a ring.

The big idea is to actually charge a superconductor ring with a lightning bolt

with no resistance, the conductor will not produce heat,
and you can keep it cool under liquid nitrogen.

* you can harness the energy from the ring by using a coil,
or you can put it in a magnetic field, and make it turn.
(i will expand this idea under motors)

...

so on a small scale,
you can short-circuit a dynamo
and remove the magnets from the dynamo,
once you charged it sufficiently...

* there may be some interference when charging a dynamo
that is short circuited... seeing that you may be draining the magnets, instead of using mechanical energy to produce current.

There are some high-temperature superconductors that can be kept cool by liquid nitrogen. You can read about it on Wikipedia.

http://en.wikipedia.org/wiki/High-temperature_superconductivity#cite_ref-Shabetnik1995_12-0

superconductor batteries may only be for very high currents that are stored...

I am still not sure how much current a normal copper wire can store... its called the ampacity of a wire... but depends on the physical dimensions also...