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 There are loads of prototype PCB fab places out there but certainly not all of them are quite so affordable - https://pcbshopper.com/
A Price Comparison Site for Printed Circuit Boards

PCBShopper is a price comparison site for printed circuit boards. Enter your PCB's specs and immediately see prices from more than 20 PCB manufacturers.

@csolisr Engineering companies will always need to manufacture prototypes. They might stop catering to individuals, but the service will exist (for a price)