The electrical versions of bicycle engines that claim regenerative capabilites only recapture 1-2% of the battery charge doing that, so it's not very good. Not only does battery density have to improve, but regenerative capabilites need to improve too. Personally, I'm gonna go with an 80cc engine, and if I was gonna go electric, I'd say a 1.5kw engine (but that's just me, I like my speed). The thing with an electric engine on a bicycle is again they aren't very powerful and hence can't achieve a good speed because nobody thinks to put a transmission for the engine, just for the pedal part (kinda weird, but higher speeds would be much more achievable).
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The electrical versions of bicycle engines that claim regenerative capabilites only recapture 1-2% of the battery charge doing that, so it's not very good. Not only does battery density have to improve, but regenerative capabilites need to improve too. Personally, I'm gonna go with an 80cc engine, and if I was gonna go electric, I'd say a 1.5kw engine (but that's just me, I like my speed). The thing with an electric engine on a bicycle is again they aren't very powerful and hence can't achieve a good speed because nobody thinks to put a transmission for the engine, just for the pedal part (kinda weird, but higher speeds would be much more achievable).