yes, just like you say, you charge the pack as it is in the plane (I really prefer this because you don't need to brake the pack everytime you charge, prevents mistakes) and on the balancer board are two 5S connectors for the balancer connector of each pack. The board comes with the charger, it's all included.

So all I do is take out the pack from the plane, connect the two balancer connectors and + and - of the pack and press charge.

The balancer board on the iCharger takes the Zippy/Rhino packs connector directly.

Volkert