RE: Battery Overheating Problems
As pilotpete2 said: AA-batteries are not for motor-use. Motorbatteries are typical "fat", not "tiny" shaped. Look for KAN or GP-cells.
Anyway: don`t forget to make sure there is enough airflow over all the components in the driveline; Motor, ESC and batteries have to be cooled by a proper airflow through the fuse. Good inlets is not enough, remember some good outlets behind the gadgets. And never run the setup static on the ground for more than a few seconds...