3.5mm bullet connector
These are famous and widely used bullet connectors in the hobbyworld. These are generally used between brushless motor and esc. This can also be used for various other connections and extensions. These are rated around 80A. For more higher ams application you can go for 4mm. Best way to fix the wire to the connector is to heat the connector in a flame and put the solder lead. Once melted you can simply fix in the wire and let it cool down. Make sure you use shrink tube for proper insulation. These connectors has a spring inside and are made of quality materail and gold plated. These comes in pair male and female.
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