Generally speaking small JST connectors are used to connect auxiliaries (BECs, LEDs etc), while 3.5mm bullets are often employed to connect ESCs to Motors. Always remember that there is no problem with using a larger connector than is required, apart from added weight and cost. Connector choice is most critical for high current applications, it's best to err on the side of caution when it comes to current rating. Another advantage of housed connectors is that they typically prevent you mixing up the polarities and shorting the battery. Bare connectors can be made safer by applying heat shrink. While housed connectors are marginally heavier, they are safer as their shielding helps to prevent electrical shorts. Housed connectors include connectors like Deans and exposed are like bullets. There are 2 main kinds of connectors, those that have the electrical contacts covered, or housed, and those that are exposed. Technical requirements such as, current rating, resistance, and reliability should principally guide your choice however personal preference based on ease of use/soldering, past experience and recommendations is usually the deciding factor. In reality this could be achieved without a connector, so this correctly implies that there are other requirements. In basic terms, a connector is a device used to connect two or more electrical elements in order to allow current to flow from one to the other. Choosing the right connector: There is a massive array of connectors on the market and they are not universally suitable for all multicopters.
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