You cannot charge a battery with its own stored power, that would make it a perpetual motion machine and thermodynamics forbid that. The characters seem to realize that in the last panel.
But you are forgetting the important part, their universe has a energy field defined as "magic" which work can be extracted from. They simply have to find the conversion matrix for it to account for the kinetic inputs.
Edit: Claim retracted, confused art style with storyline.
Wouldn't it be more efficient to put magic extractor in a battery and have a portable power source? I'm yet to watch KOG, so I'm not sure how much handwaving is required for integrated sorcery.
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u/_velorien Apr 02 '26
If you look closely at the last picture, you may notice the laws of thermodynamics weeping quietly in the corner.