Trackpower.. yes, no?

[captain harlock]

Yep! Those are the ones.

If you are going to use them for the trakpower, you'll need three males and three females.( two for the pack, two for the controller and two for the balancer).

However, if you're gonna use the 4mm for the balancer, this means you won't be able to charge the flightpower packs if you'll use the 5.5mm with them.
You either have to use the 4mm generally or make an adapter to connect between the FP packs and V-bal.