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Very interesting. I would love to see a video where someone does it from start to finish.

I would also like to make my own battery for the bike. I made a cheap DIY spot-welder from a microwave transformer and spot-welded my first 12V 20 Ah battery last week for a 3d printed robot lawn-mower project.

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Building the battery pack yourself would give flexibility regarding size and shape of the battery pack. Maybe you could put them inside the seat tube?

You can often find faulty drill packs and harvest the good cells from those and cobble together a pack. Charging it safely isn't easy but can be done. There are battery management systems you can integrate. It's difficult to put inside the seat tube but putting it in a custom container on the down tube works well and that's a great place to put the added weight.

Doesn’t sound like a good idea to me… a malfunctioning battery would turn that into a blowtorch aimed at your nether regions.

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