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This is a compact version of the fuel cell engines popular in energy-conscious societies. It uses a radial fuel cell design to minimize bulk and maximize electrical output, with enough capacity to run the suit for a solid year and provide six hours of flight when the gravity pack is in use.
I think it should probably be a hydrogen fuel cell...and the layers can be swapped around, it's not like the suit isn't reversible. Even though I didn't state that I figured they'd want the layer on the outside where the air is.
I was going to add an energy blade system, key here being was, but I think I'll leave that to being a separate submission.