I am aware of battery break in, motor break in and even car break in. For motor break in, i understand its all about the metal bushing.....to remove all the dust/dirt/grease etc from the metal bushing such that the metal bushing is in 100% contact with the rotatory motor. Now, what i don't understand is......why do you need like a specific voltage to break in the motor? It sounds to me more like a cleaning job than an electrical one. For me, i am using the attached tool to break in motor by running the motor in forward 6min motion and backward 6 mins motion for 3 rounds then followed by applying motor oil to the motor after cool-down and then spray lubricant to give it a thorough wash-up. Do you all recommend using rechargeable batteries or alkaline batteries to break in tuned tamiya motor? Any real advantage in purchasing and using that GForce Mini Motor break-in system over doing it the way i do now Thanks.