In this schematic the "Protector,batt" is used most often.
Parts such as the Battery: Battery Assy (12v) Yt4l-bs, Cushion 20x45x6, Protector,batt, Battery 12v4ah are included in the Ay50w 1999 (x) Battery parts fiche.
Of all the components that make up this Battery the Protector,batt has the lowest price.