I bought a used slash with mamba max and 4800kv motor on it. the venom 6400mah 3cell lypo(venom part # 15009) it came with is puffy on one side so ive been told its fubar. wondering what kind of ratings I should be looking for to run this happily. i just bash, no intention to ever race. also it had 13/90 gearing on it, but the spur was fubar from previos owner having the pinion setup with the set screw in the mesh lol. I have a spare 83 tooth, will 13/83 be ok for playing around? or big risk of meltdown?