I don’t know if taking energy from the body is a good idea.
The laws of thermodynamics will require you to compensate. Also playing with very complex systems like a human body, neglecting what the side effects might be, is unwise on a good day.
We're approaching the point where someone will put together every form of energy harvest, solar, kinetic, temperature, air pressure (from wind, etc) and just store it in a super-capacitor for whatever you are wearing/holding, watch, phone etc.
Garmin already has solar on many watches to extend battery and the Kinefox is already doing kinetic on animal tracking
Morpheus : "The human body generates more bioelectricity than a 120-volt battery and over 25,000 BTUs of body heat. Combined with a form of fusion, the machines have found all the energy they would ever need."
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https://journals.plos.org/plosone/article/figure/image?downl...