My preferred solution: an USB power bank with an integrated LED light. The power bank is a DIY version which is sold empty and can be filled with second-hand 18650 cells pulled out of broken power tools or laptop batteries (6 cells in parallel).
They’re sold from China for about 6 € and provide light for tens of hours when filled with 6 x 1700 mAh cells. I think the brand was “Haweel”.
If the motor mount is hackable with reasonable effort, and the motor controller’s interfaces are open, then in principle… yes.
Yet in reality, companies build extremely complicated cars where premature failure of multiple components can successfully sabotage the whole. :(
I’ve once needed to repair a Mitsubishi EV motor controller. It took 2 days to dismantle. Schematics were far beyond my skill of reading electronics, and I build model planes as an everyday hobby, so I’ve seen electronics. Replacement of the high voltage comparator was impossible as nobody was selling it separately. The repair shop wanted to replace the entire motor controller (5000 €). Some guy from Sweden had figured out a fix: a 50 cent resistor. But installing it and putting things back was not fun at all. It wasn’t designed to be repaired.
Needless to say, replacing a headlight bulb on the same car requires removing the front plastic cover, starting from the wheel wells, undoing six bolts, taking out the front lantern, and then you can replace the bulb. I curse them. :P
But it drives. Hopefully long enough so I can get my own car built from scratch.
For me and my habits, these have been working for a few years. They cost me about 75 €. But as always, product portfolios change and most likely they’re out of production. And maybe they’ll break this year, making my recommendation premature - but I see no signs of breaking yet.
Why I picked them: they had a rubber lower part and a string-tightened but closed upper part made of fabric (no “tongue” with open sides, no zipper, zippers can break down). My access way gets flooded often, and most of the flooding occurs during cold weather. So I often walk in snow that has ice and water underneath, and break it when walking. I could use rubber boots, but then it would be cold.