2s should be well ok.

this is no guranatee however. depends on how u run in, what the discharge of the lipo is (how many c) and if youve fitted bigger wheels.

the stock vxl system is great and the waterproof makes it an easy choice for most. i found running 5000mah 30c 2s that I HAD to have cool down periods after each pack, i suggest you do the same.

to be 100% safe get a temp gun, its the only way of knwowing for sure all is happy