The Yokomo S4-118BSA urethane battery spacer is produced to sit precisely in the YZ-4S battery compartment and secure smaller Li-po batteries. Its urethane build keeps the pack stable and reduces the chance of battery movement during spirited runs.
Adding the Yokomo S4-118BSA to a YZ-4S removes slack around short packs, helping to keep connections solid and power delivery predictable throughout a session.
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