In my Micro 3D planes I set out to see what' s possible in current draw of a servo style plug by using it on the 2s battery as a main lead that acts as a balance lead thus elimination additional wire and plug weight. By plugging it in to a 12amp esc. The setup is 8-9 amps continuous wide open throttle. This over 5 years no issues, I'm convinced they are more than capable beyond 3a.

The 4S Cellpro on A123 2s is an interesting reply because I have that exact setup and it gets warmer on servo style plug as a balance lead than does the Motor/ESC setup of which I never felt any heat as a 60 watt setup. I contribute it to the wire gauge as not proper as compared to the motor setup which is the larger 18g versus 22g.

As a side note what I do religiously is not to intermix mating plugs from different manufacture brands. The pins are a rolled U shape design and not all U shapes or oriented the same to mate up by OEM design for most contact surface, You can actually get a worst case scenario going across the thinnest profile of the U.