Edit - OK, I see I was right.. It'd have to be 2x 2S...
https://www.amainhobbies.com/protek-...k-4500/p212522
I guess if to use a 4S I just have to solder one or two wires I'd do it.. I have a ton of 4S lipos...(planes and quads etc..) But don't have any 2S, except very small for micro quads..