Ah, midichlorians, I forgot about this "shortcut".
"Super batteries" allowing to store vast amounts of energy in unknown form and then siphoning/relaying it in some unknown process,
effectively changing quantum properties of particles in visual/close range
to make an alchemy-like transmutation/spawning of them e.g. to impact gravitational field of some specific object.
My theory would be less a battery, and more of a catalyzer. There is extreme energy existing everywhere, just in forms we cant' do any work with or dont desire.
This thing would be able to shuffle quarks. using the energy of one field to create another. So energy is not stored or created, but transferred in away that circumvents the current means of accomplishing those conversions through fusion and kinetic energy.
these organisms are perfect quark catalyzers.
And all this energy is being processed without any damage to the host as long as he is acting "in sync" with the light side of the force.
Otherwise it can cause some burn/dehydration marks.
I think I have no more questions.
i would suggest that the light force users have trained themselves to create conversions that are efficient (yet maybe slower or lower power) and thus produce less fields that are less harmful to the host and things around it. Or the requested conversion doesn't involve converting to or from something that is harmful to the host.
where as the dark side is about results ...sometimes regardless of the way those results are achieved. Perhaps there are multiple ways to do something like push a person back ... perhaps one way creates a concussive force in the atmosphere in front of a person. Another might try and pull that person away magnetically or even gravitationally. The consequence of doing it one way or the other could be in the fields needed to convert from ...and the unwanted byproducts of that conversion (the amount of which would be related to the efficiency of the conversion).
like maybe you can't convert the weak nuclear field to the EM field at a given wavelength in a given direction without also producing EM fields of a certain wavelength in the opposite direction (like yourself). So shooting force lighting at someone creates an equal and opposite type of field back to the force lighting user. Destroying their own cells faster or beyond their ability to shield themselves from such harm.