RE: batteries
me no
I got 3 Nitros and my one I used the most still has its batteries from last season and there going strong. Only time I had to replace them was when I forgot the receiver on over night [X(] (almost did it last night)
But I also use D-cell glow plug warmers also.
My controller also lasts for over 10 hours on one set of batteries. I forgot it on for 7 hours and used it over 5, and its still good according to the voltage monitor built into the controller I'm estimating they will be good for another 5 hours.