It was a hard decision

[jnev]

Oh, wow, I didn't realize that the 10Ah pack was that much bigger. I do need decent run time, so I will probably go with the 8000 pack then, since I will only have 1 battery to run at the beginning. Then maybe later, add the 5000 pack.

As for gearing, I think I will try a 16t pinion instead of the 18t and just watch the temperatures. From your experience with this set up, does it run really hot? Even with a heatsink on the motor and the original heatsink on the MM esc?

Also, what kind of run times are you getting approximately with the 5000 pack for comparison on the track, bashing or anything?

Thanks again for the help.