The S4-118PA is a purpose-made graphite battery mount for the YZ-4S series. It is dimensioned to accept common pack sizes used with the chassis and is compatible with the B-YZ4SF option.
Constructed from a single graphite panel, the plate increases chassis rigidity over basic polymer mounts and provides a stable reference for battery location. That stability is useful when balancing weight front-to-rear or left-to-right without modifying other parts.
Fitting is simple: remove the original battery holder, align the graphite plate to the existing chassis mounting points, and secure it using the factory fasteners. Standard hex drivers are sufficient; ensure hole alignment before full torque to avoid stressing the fixings.
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