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Always lots to learn on such a project. Regen braking is a help both in braking and energy saving especially in city riding. Ultracapacitors can be useful and less expensive than additional batteries while being part of the frame. Switching between parallel battery and series connections as part of the controller program could help match available current to motor demand especially at low speeds. Look at the gains from streamlining for more range. See craigvetter.com for info.
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