One factor that could have influenced the outcome of this experiment is the temperature of the motors. After each test the motors would heat up. If another test is conducted immediately after completing a test it could alter your results. I did give the motors a rest after each test, but maybe I could have taken a longer break. The Duracell batteries lasted longer. I would recommend Duracell batteries to anyone who needs to power an RC vehicle, electric motor, or anything else that drains batteries rather quickly.