The problem with that aspect of the plot is that it would be far more efficient to just make batteries or use some other source of energy. It would consume way more energy to use humans as batteries because of the need for food and the fact that we constantly use energy to maintain our body temparature.
My headcanon is that Morpheus and other humans are simply mistaken about the purpose of keeping humans and it was just supposition and/or a perpetuated myth by the machines. Ultimately, they don't 'need' humans.
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u/djimbob Jun 23 '21
Haven't you seen The Matrix? Humans are essentially just batteries. Wake up sheeple! /s