I hacked car charging to work with my electric bike!

https://www.youtube.com/watch?v=i6IyukCIia8

I fixed the biggest problem with electric bikes

YouTube
And of course it involves a custom circuit board. Companies like PCBWay and JLCPCB have made custom circuitry far easier than before, but I wonder what might happen when those shut down with no replacement.
@csolisr Engineering companies will always need to manufacture prototypes. They might stop catering to individuals, but the service will exist (for a price)