I wanted to hop up my stampede so I installed the novak 5800 ss. Wow what a difference, it flies now but the only problem is that the batteries are melting at one end. Its the end opposite the battery connector . I have read that the gearing has to be correct ( novak recommends 17-18 pinion and 84 spur) or it could heat up but I didnt think it could melt the battery. Has anyone come across this situation and fixed it?MY pinion is 23 and the spur is an 81. Any info is appreciated.