Step one of rebuilding the e-bike my co-worker gave me is grafting a different battery management board onto the battery pack.
Transplant complete!

I still need to figure out how to wire up the charger plug. They used an XLR connector with four pins, and the charger doesn't turn the power on until it senses something (maybe a temperature sensor?)

Edit: i just needed to check the back of the charger for the pinout

A lot of fiddling later and i have the charging port connected and everything stuffed back in the original case.
Good news! It charges!
It's Friday night hacker meetup and i am working on reviving the e-bike with the parts i ordered from AliExpress
It's gonna work!
@MLE_online
The smile of success is the best part of this video. I love it when there's geeky success, mine or anyone else's.
@TTFKA_Tay0 it's exciting when things work!
@MLE_online
Yes, thanks for sharing that video.