With a quantity of three pieces, the Screw,tap.,4x12 is the most used part in the BATTERY - XL500S 79-81 diagram.
Some items from this specific schematic: Fuse,10a,25mm, Battery Assy. (6v), Hinge C,battery, Batt,assy6n4-2a-4.
The sub assemblies and components that make up this Battery - Xl500s 79-81 include this Battery,6n4, the most expensive part.