Bill: The key point here is to make sure you check for and remove any binding in the linkage that could draw th system down. Careful examination of the linkage and the end points will help out and will surely help with the flight time on flying day. And, of course, how you fly too. A lot of overcorrection will quickly drain a battery pack as well.

I've never had a lock-out with my DX7 receivers and I bought mine way back when they first came out. I've used both 4.8 and 6 volt packs. I am using 1200 mah 6 volt packs pretty exclusively now, though.

CGr