The constraint is that everywhere else in the solar system is a shithole, not the energy to reach the shitholes.

Outer space is pretty much a nuclear furnace with no gravity, not a very appealing place to go. I haven't heard of an serious solutions to either of those problems.

I know of no way to generate lift in a vacuum using a battery with unlimited power. You still need to eject mass away from you using fuel which is finite.