Originally Posted by Aether4E0A

I found it: "Hobbywing Xerun Super Capacitor Module". That module looks fine. It is two polymer caps in parallel, they should work well. Just be sure to solder the wires properly, and that the wires are as short as possible.

Its called a "super capacitor module", but it does not use actual super capacitors; it consists of regular polymer caps. Hence, their ESR should be low enough.