I was running my llumar boat on a Nemesis 8XL motor with a Hacker Navy 70 speed controller. I ran up to 4s. I actually have the motor, speed controller, and two 3s lipo packs if you are interested. I will sell all for $150.00. You can call me at 858-822-9097. The lipos are Thunder Power extreme packs 2200 milliamps, and used them in Parellel.