http://www.hangtimes.com

Get a NO BS Batteries transmitter pack. I have a 1650 pack and I can fly several helis and a airplanes all weekend not get to the transmitter battery alarm.

Hog, thats hogwash, there's all kinds of people using other than Futaba batteries on recievers, as long as you dont blow it up with a battery thats over the rated voltage I doubt they would deny a warranty claim and if you are worried about the transmitter warranty just stick the 700mah factory pack back in before you mail it off, but I doubt they would even care about that, you dont have to undo any screws to change the battery and as long as the battery didnt directly cause the problem I doubt they would care.