It was kinda my dream to have drop-in kits that would turn any ICE into a plug-in micro-hybrid and just run the electric system off extra batteries for as long

It was kinda my dream to have drop-in kits that would turn any ICE into a plug-in micro-hybrid and just run the electric system off extra batteries for as long as possible, and then kicking in the alternator once finally required. Could work as more and more stuff becomes electric in cars instead of running off accessory belt.