Definitely make sure your RX battery is fully charged. Charge it for 24 hours the first time new out of the box and monitor it carefully. If it goes low on you in flight the RX will reset and leave you w/o a RX for almost 5 seconds and a lot can happen (nothing good) in that time. A 6v pack or higher capacity 4.8v RX pack is becoming common with Spektrum systems in the field.