I just got the MM2 Fly More combo and I can't charge the batteries and the RC at the same time. I have the battery hub plugged in and see one of the batteries is charging. From what I gather it charges them in sequence, so it will likely take a while before they are all charged. I also see there is a USB out port to connect the hub to the RC but there isn't another cable in the kit for this. Do I need to get another cable or am I missing a part?