[inportb]

Overlooking the cell chemistry issue...

... you cannot just dump unlimited current through a superconductor. Once you exceed the critical current density, your superconductor becomes a regular conductor.

[galangalalgol]

Also the thing will be a really strong magnet while it is storing energy. Even if it doesn't rip itself apart it will stick to stuff amd lose energy.

[mytailorisrich]

And in any case whatever power source you're using cannot deliver infinite power.

[tmpX7dMeXU]

Who said infinite power?