ORIGINAL: giddyuperic
Why do you say over killl? Because mAh is only the length of battery time will last right?? I have been running the 6 volt battrys in all of my other planes and not one problem. I run spektrum DX6i.
Well what you shoot for is the Rx and ignition batteries lasting the same amount of time. 2500mah on the Rx will be good for approx. max 90 minutes of flight time, 90 minutes ignition time consumes approx. .057 watts/minute. That would make 1A at 4.8 volts, 0.8A at 6 volts (2S1P A123 w/ rectifying diode). AA size NiMH batteries of any capacity all share about the same weight, so you could look for a solution w/ a smaller size so less weight. If you wanna use NiMH batteries, size 2/3AA would be your best bet. You would save about 35 grams/little over 1oz only.
http://www.powerstream.com/Size.htm