TimXLB - Thanks.
What that thing would be ideal for, is running in a new cars drive train, stick in an old motor, do necessary drive train prep, gear it as low as hell and plug it in for 12 hours at 5v.
You may need a fan to keep the motor and ps cool though.
What I normally do for motor run-in, 4 cell with the radio trim at 50%-60% for a minute to a minute and a half depending on when the aching stops. Works great. I usually do all my motor prep before I go to the races anyway.