Are JST connectors safe to use with 3S LiPo packs in small RC planes?

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Question: Is a JST connector safe for 3S packs on small RC planes?

Answer: JST connectors, specifically the common JST-PH (2.0mm pitch), are generally designed for low current applications and are not ideal for 3S LiPo packs powering small RC planes. A 3S pack can deliver higher currents (often 10A or more), which may exceed the current rating of typical JST connectors (around 2-3A continuous). This can cause overheating, voltage drops, or even connector damage.

For safer use, follow these steps:

  1. Check the current draw of your motor setup and ensure it stays below the connector’s rating.
  2. If your current is higher than 3A, switch to higher-rated connectors like JST-XH, XT30, or Deans, which handle higher currents safely.
  3. Ensure solid solder joints and avoid thin or long wires to reduce resistance and heat build-up.
  4. Regularly inspect connectors for signs of wear, discoloration, or heat damage.

In summary, avoid standard JST connectors for 3S packs unless your current draw is very low. Choose appropriately rated connectors to ensure reliability and safety in your RC plane.

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