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What's this thing called?
(slrpnk.net)
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It is a 4 pin(or 1x4) JST(?)wire connector. You need the measurements in millimeters of the connector and the distance between pin centers to know exactly what standard that is unless you have examples to guess and check.
The pins that make the connection do sort of need a special tool to crimp, but you can manage with standard wire crimpers and some doing.
It's a 2.54mm JST-XH