Are JST connectors safe for 3S LiPo packs in small RC planes?

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

Answer: JST connectors, specifically the common JST RCY type, are generally rated for around 3–5 amps continuous current. For a 3S LiPo pack in a small RC plane, the current draw depends on your motor and ESC setup. If your setup stays under this current rating, using a JST connector is safe. However, many 3S setups can draw higher currents, especially on takeoff or under load. To be safe, check your ESC or motor specs to estimate max current. If it exceeds 5 amps, consider upgrading to a connector rated for higher current, such as XT30 or Deans. When fitting the connector, ensure clean solder joints and use heat shrink tubing to prevent shorts. Also, keep wire length as short as possible to reduce voltage drop and weight. In summary, JST connectors can be safe for low-current 3S packs, but always verify your current draw and upgrade connectors if needed for reliability and safety.