I just installed the capacitor bank to my motorbike (bmw r1200gs)
Carged it up to 15v and it fired right up. Was very pleased with myself. Bike runs great.
Unfortunately when i stalled the bike and immediately hit the starter, no joy, it turned once and did not work
I will see what i can do to charge it up to 15-16v from a battery (lithium ion, with a boost converter)
Maybe a usb c powerbank that can deliver 12v and 100 w may be a good multi purpose choice.