Capacitor Bank as Power Source??

Hey guys, just wondering if any of you have, or if its possible to build a capacitor bank and use it as power source?

I realize the run times could be incredibly short, but then again, so would the charge times. I ask this because I can obtain large quantities of used power supply caps for free. They are 10,000uF 40VDC.

I run my Emaxx on 16.5V, so what I would like to know is, is it possible to build a capacitor bank using 40V caps, but limit its output voltage to ~16V, while still allowing it to discharge at its max current capabilities?