I doubt one in ten thousand have your experience, your skills will be very much in demand if SHTF.
Me, I’ll just do nickel and dime stuff. Small engines, whatever.
Remember, there will be tens of thousands of cars out of gas that still have very good batteries and alternators in them. Use your imagination!!
Remember generators and relay regulators?
Batteries should be fine.
I'll manage. I've been winding coils (frequency specific) since I was 10.
/johnny