Hi Guys,

Austin here with MaxAmps. The speed control does not determine the amp draw, the motor does. If the motor is pulling more than 120 amps constant, go with an 8000 pack. Most people are going to want more than 3 minutes of runtime anyways.

For the record, MaxAmps packs can be used with the MMM speed control. Depending on what MaxAmps pack you are using and the amp draw of the motor, you may need a different pack. I think that is what castle is trying to say. If you try and run any 4000mah pack with a 200 amp constant motor, you are going to have trouble. It has nothing to do with a MaxAmps pack vs another manufacturer.

Hope that makes sense,

Austin
CEO MaxAmps.com