this post was submitted on 16 Oct 2025
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If you are drawing energy out of a system them that amount of energy is removed from the system. A freespinning gear won't generate electricity. It has to be pushed, which requires more energy from the power source, and is always a net loss because of friction.
That is before the added weight of the additional batteries.
So trying to get energy back from a moving cycle will result in a less efficient bike.