super capacitor

Hi guys, First time poster here so be gentle... I have a Gen1 Nissan Leaf 30Kw and I want to increase the available power. I was inspired by Arlin Sansome's videos on Youtube: https://youtu.be/S6OInkLWAhk I like the idea of potentially creating a bolt-on kit that anyone can purchase and...

Im looking into incorporating super or ultra caps into my design project to deal with the power generated from regen braking. Does anyone know what kinds of current/energy transfer rate a lithium ion battery can handle? I dont want to waste time looking at capacitors if the batteries can...