[DaveG28]

Originally Posted by Dagger Thrasher

Nooo, that thing is waaaay too big (physically); thing is with electrolytic capacitors is that, generally, the higher the voltage they can handle, the bigger they are even at the same capacity. That thing's a bit of a whopper unfortunately!

You should find one of these will suit you just fine:
http://www.maplin.co.uk/Module.aspx?ModuleNo=13472 (You want the 4700uf 16V one).

You could certainly increase capacitance with no ill effects, but with diminishing returns. On 2S LiPo, in your application, 4700uf will be just fine. :-)

Is that one Low ESR though (whatever that means!?)