I would take a different approach. As
@Foamforce explained above, buying all the stuff for connectors, etc is a PITA.
Why not just buy 2 to 4 batteries(each has 2 spares) so you can be flying, one is spare and ready to go, the other is in the car or house charging. That would be almost non stop flying.
So, for $24 dollars($5.99 each), and by the way pick up one or more spare sets(the 2 motors, Flight Controller, and a battery) for $19.99. You will always need a spare especially if you are crashing a lot learning how to fly. Or if you try designing you own plane. This is a good cheap way to see if you are going to continue in this activity.
Then, if you or your boys are going to continue on flying, you will need to purchase charges, electronics, etc. for 3 and 4 channel planes. You will find out that this forum can guide you as to what to do.