Can you hook an alternator to an electric motor and have it charge the batteries as it runs?

simpler that. if go down hill motor generate , charge battery. problem battery efficiency if use super capacitors instead of batteries able re-coupe of energy. clever electronics can power when brake bit expensive. simple bike mode of transport , has little room improvement. did assume not trying invent perpetual motion machine.

or bike generator (or same alternator, im new @ this) im starting project electric bike, , looking ways keep running longer 3 or 4 hrs runs now...will idea work or else have ant better ideas without breaking bank.

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