It really does not work like that, you start mixing everything and everyone up in a depressing blob after a while.
I can't even remember the names of people i thought I loved or at least cared about.
Compared with my last five years in a serious, committed relationship, its a night and day difference.
To the next five years, and the ten after that hopefully.
Sounds like you have no idea how dangerous is to put your hands around electric car batteries and how expensive certified electricians are. Without a mechanic that ALSO has an advanced expert certification for high voltage electronics, the blown BMS or contactor (500$) becomes a whole battery to scrap (20k). Then you add the 6 hours of diagnostics and labor on top of it.
Electric vehicles are not an arduino circuit with a couple of led and an usb cable.