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

Congratulations!

@alienghic @MLE_online Oooh, no random tariff madness with AliExpress anymore?

@ai6yr @MLE_online

I have bought some random cheap junk for my family like pens or stuffies and everything went through smoothly.

I think china bullied trump into behaving by threatening to take away the rare earths needed to manufacture the fancy weapons

There may be tariffs but the chinese vendors know how to include it into the price.

@alienghic @MLE_online Good to know! (not that AliExpress would let me order last time... they were using some phone number checker, which I swear is tied to FB, and believes I do not exist. 🤷 )

@ai6yr @MLE_online

i gave in to that identity validation to deal with begging by kid.