It produces charge on its own. It is Dr. Kuseno's ingenious technology. It isn't the only technology of its kind, I believe, but it is unparalleled.

However, Dr. Kuseno had emphasis on me retaining enough normal human habits, so I can also burn food as biofuel. He wanted me to live as normally as possible. He really is an amazing man.

[One of the two people Genos cares about the most!]