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> a miniature charged black hole that can be fed regular matter to produce power,

What form of power and through what principle?

Hawking radiation, I think. Yes, this is at best speculatively feasible.

Probably more like a water wheel - matter spinning around the hole can be accelerated.

A spacecraft carrying a blackhole as propulsion means probably would have poor power to weight ratio.

Not at all. It would have one of the best power to weight ratios possible.

Now as to whether you could use all that power....