Story is set in our days, modern Earth with all it's current problems and conflicts. Let's say someone had secretly found a way to produce almost infinite (reasonably infinite, of course) amount of energy in form of electricity, it's easily scale-able in power, it takes size just about standard suitcase and weight is small enough to be carried by just one man. For a "field experiment" it's used as a power source for an actual battlefield helicopter, similar to something like MH-53 in characteristics (in terms of size, weight and capability to use on a difficult terrains to land and take off).
It's usage pretty crucial for story, as this helicopter is used as a transport for hundreds and thousands of kilometres, with range restriction only in matters of pilot endurance.
My question: is there any way to transform electric current into rotation of blades, and other outputs, needed to operate a helicopter properly? I mean, there are a lot of electric engines with enough horsepower to lift a helicopter, but they weight and are measured about as big as a helicopter itself.
Re-clarification of question: currently available electric engines, if replacing original engines ot that helicopter, will be size of a helicopter itself and weight >6 more times than original one. Do I just don't know about more reasonable e-engine solution, or there is just no any?
Sorry for any errors or misspells, English is not my native language.