Im looking to buy either an Venom racing fireball 13 double, or an orion SV2 method 13x2 or an LRP V10 spec 4 12x2 which one would be the best ? Ive been told that their performence is excellent but the running time is very short with a normal battery. Which battery would be best for performence & running time? also i know you have to maintain these motors what does that involve. If anyone could give me any info on this id be very greatful. Many thanks