Hybrid Power is a mystery to me and I built those Indy Cars from ‘85 to 2000.
Chevy,Ilmors,Buicks Hondas.
.
Being the ‘Wire Guy’ starter carts were easy Three 12V battery’s and 10 ft of
Cables that would Jump when the button was pushed! ——weird.
In Series or Parallel ? With the "jump" I'm guessing Series.