unfortunately !
Is 330uf/35V stock. can't support 6S is not Cap's problem!
since Quark esc is 5S max, i think they mistake data.
i am very sure.
so in korea local hobby shop they quark alway is
Cells : Ni_Cd 5~16 cell
Lithium 2~5 cell
take look here
http://www.psyhobby.com/shop/shopdet...ch=&sort=order