RE: single battery possible?
two issues are being discussed
1. is rf noise passed thru battery?.. the answer is no, just go as the engineers at apc or the likes the battery absorbs the spikes and noise.
2. 200ma nimh dont have enough amperage output to supply the draw of the digital servos and ignition, lipo and life batteries do....
why would any one use nimh in this day and age is beyond me, they cost more do less and fail often, as well as having much shorter lifespan, and weigh more, and cost more.