Deans 3-pin battery connector (black)
Genuine Deans brand 3-pin black battery connector. Goes on the battery pack. Highest quality connector, for small-to-mid size amperage motor applications.
The battery end (the one that is ON a battery pack) only has pins sticking out of 1 side.
Polarity (see picture, going Top to Bottom):
Red(POS+) is in the middle position
Signal (or just not used). This is the position separated by the groove