I have the JR X9303 radio but all the receivers I have are Spektrums. My solution was to simply go to high Mah (1500 -2000) 5 cell 6 volt packs. I've never even come close to dropping down the 4.8v yet. But if a user wanted to use dual 4.8v packs that would take care of it as well. As I said, I think that Specktrum should ship the radio with a higher capacity receiver battery. In this day and age of battery technology there isn't any reason why they couldn't. High capacity batteries are cheap.

Ken