An exotic yet portable powersource
For my current setting, there will be super robots of ludicrous proportions strutting about as though they own the place (which in all honesty they actually do). So, being so nonsensically powerful, they need a suitably nonsensical power-source.
However, I dislike creating green-rocks to use as a fuel, as it tends to get out of hand quickly as I start fleshing out its properties, as such, I was thinking of using something that, at minimum, must be able to exist in our universe.
So, the question is, all limits of current technology aside, what would be the most powerful portable energy source available? Would it be like a miniature sun? My friend had previously suggested something he called a 'Binary Black Hole Generator', the science of which eludes me.
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So I remember a story with a submarine that was powered off a big flywheel, and every once and a while they'd have to power up the engine to spin the flywheel back up.
Lots of other people have mentioned black holes as a way to generate power using gravity or whatever, but what if you just used the frame dragging effect of a spinning micro black hole for it's kinetic energy as a flywheel that never needs to be spun, or at least as a way to keep a normal sized flywheel spun up.
Edit: the flywheel would also act like a gyroscope which would give the robots a bit of stability in regards to walking.
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