Kevin, Yes, all of our dc brushed motors can be reversed in this way.

Michael, It is not the physical size of the battery that is important, it is more about the battery chemistry and whether it has a low enough impedance to deliver the currents needed by a brushed motor both when initially starting and when under full load. You need to choose a battery of the appropriate voltage able to deliver the current needed for the load you place on it. This motor is rated 0.85A at 3V at its nominal load.

We are currently adding more data on the MFA range but not yet got around to this motor so we have just placed a dimensioned drawing in the 918D page. Shaft length is 8mm. We sell batteries (primary and secondary) and battery holders if using individual cells. As to choice, that comes down to your application where battery dimensions, running time, battery weight all contribute to the battery selection. These motors are small and intended for 12V operation although 1450-034 lends itself better for battery operation as it is a 3V motor.