How well do batteries compare to human energy storage in fat?How well do batteries compare to human energy storage in fat? (self.askscience)  The

How well do batteries compare to human energy storage in fat? : askscience

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2022-05-15 07:30:03

How well do batteries compare to human energy storage in fat?How well do batteries compare to human energy storage in fat? (self.askscience)

The article about the robotic arm made me curious--apparently it was 6 lbs and lasted about 3 hours. How long could we move our arm using 6 lbs of fat?

According to Wikipedia's entry for the energy density of Lead Acid batteries (cheap+heavy), you would need 878kg of batteries to equal that amount of energy. If you used Lithium Ion batteries instead(light+expensive), you would only need 122Kg of them.

So compared to fat, batteries are crap. Here's Wikipedia's chart of energy densities that lists a bunch of different types of energy sources, fat included: http://en.wikipedia.org/wiki/Energy_density#Common_energy_densities

So there is over 50 times more energy in human fat, than in fully charged lithium-ion. Imagine how great it would be if we could hook electronics to the body and burn calories to lose weight and power our cellphones, laptops etc.

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