Are JST connectors suitable for 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 RCY (2.5mm pitch) type, are generally rated for currents up to around 3–5 amps. For small RC planes using 3S LiPo packs, this can be borderline depending on your motor and ESC setup. If your plane's current draw stays below this range, a JST connector can be safe. However, if your setup pulls higher current, the connector may overheat, risking damage or failure.

Step-by-step advice:

  1. Check your motor and ESC specs to estimate maximum current draw.
  2. Measure or estimate peak current during flight; if it approaches or exceeds 5 amps, consider a higher-rated connector.
  3. For safer operation, use connectors rated for higher current like XT30 or Deans.
  4. Ensure all solder joints are solid and insulated to avoid resistance and heat build-up.
  5. Regularly inspect connectors for signs of wear or overheating, especially after flights.

In summary, JST connectors can be safe for low-current 3S packs in small planes, but always verify your current requirements and upgrade connectors if needed for reliability and safety.

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