Batt, anything cheap will do ... try to get a NiMh pack as the Nicad packs won't perform as well. At most I only take 1000mAh out of a pack on a run.
Once did a whole meeting on one charge on my 3700s as I forgot my charger and nobody else had a charger with deans on!
Radio wise, anything will do. Worth going for a slightly better than stock servo though, a mid range Futaba would be my choice (only due to the fact that there is no option to use my prefered HiTec servos).
Talking of servos put a stiff cable tie around the servo-saver-ring .... it's not strong enough and gives vague steering and can even overload and snap if you don't!!
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