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It's hardly dodgy. He tested and charged each cell to the correct capacity before wiring it up. He 3D printed an interlocking battery holder. He even installed a BMS with a temp sensor.
Dude's build is significantly better than some of the shit China is trying to sell on Amazon.
You gotta give credit where credit is due.
Kudos to him. But the title is misleading - he didn't build an e-bike, he built a battery pack/kit. Reading the title and looking at the picture I thought that he melted the plastic to mold it into a bike frame...
I collect them to pull the battery out of.
I've got a bunch of rc pieces I'll probably never need due to simply not needing all 20 cables or whatever in the pack. So all my leftover jst connectors go to "old" lithium batteries, and I use them as little power banks for my phone, and arduino stuff.
They typically don't last too long, and range between 200-1000mah, but it's something that isn't "taking up space in a landfill or being crushed and setting something on fire"