let's take an exemple :
Hmm, lets see what we'd need for .1 second of discharge. V(t) = V0 * e^(-t/RC) C = - t / (R * ln (V(t) / V0)) C = -.1 / (.003 * ln(3/6)) C = 48 Farads Now a cap that large would need the ESR/ESL factored in as well, and hopefully the electrolyte wouldn't get cooked out...