Great Planes Ammo for Rustler/ E-Firestorm

Ok, I got my batteries and I mounted Ammo 36/56/2600 in my sons Rusty, but it is so wet here in Finland that we couldn't drive it outdoors. What I have tried it indoors, it works ok. I have to seal end of the motor before we go out with it. I have only 20t pinion and stock spur so it's not too fast for my 3,5 year old son with 3s 8000 mAh Maxamps Lipo. Now we only have to wait for minus celsius degrees, then my son gets permission to punish his first RC car. He have been practising well with my BL:s, Minizilla, MLST and Tamtech the Frog so he should be ok with Rusty, at least I get something to fix if not.