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.
@MLE_online this looks like fun!
@coleens_ yes! I love hacking a thing back into working
@MLE_online and we love watchin you do it! 🤘