ORIGINAL: KitBuilder
3 yrs is long overdue... go with NIMH or lipos for the airborne unit.. lipos are way cheaper for more capacity but you will need a regulator unless your rcvr and servos can handle it 7.4. I use 3 cell in case I lose one i'm still good.
I am going with the A123's for my flight packs, much better than NIMH and Lipos. Longer life and none of the fire problems of Lipo's. they do not lose charge !!!
But you need a LiFe/ A123 chargers for them.
sticks