7758B Standard Motor Kit for Fan-Aspirated Radiation Shield, with batteries Replacement motor kit for all 24-hr fan-aspirated radiation shields Due to the time and effort involved in replacing the fan assembly, it is also an appropriate time to replace the unit's batteries. 2 nickel metal hydride (NiMH) replacement batteries are included with the kit. Over-molding has been added to the exposed leads of the fan motor to further prevent corrosion in the field.