RE: What Connectors for Cobalt 400?
In view of the potential amp draw of this Cobalt motor (18A-31A max) you need to use 14ga wire and Deans Ultra connectors [unless you want to join my band-wagon and go for 3.5mm Gold Connectors!]. A 30A ESC is recommended so you know you a going to be putting serious current through this thing - what you get out is another thing, but I'm not going there.
Cheers, Phil