Been down this road with the Spektrum. The 4.8V that came with it, throw away now. 6V and you might as well get something in the 2000 mA range and be done with it. They are saying that I had the dreaded voltage drop and I was running 2 of a 6V, 2700mA packs for 5 digital and 2 regular servos. I don't know what more I was supposed to do (28% Extra 330 totally trashed). No help from Spektrum at all. Suggest that if you are flying Spektrum on big planes to use one of those power panels and never fly the 4.8V on any plane with it.

read on: http://www.rcuniverse.com/forum/forumid_116/tt.htm