Okay so it says 10A nominal and 20A max.hmm.. ok I thought Higo and Julet were both clones of another brand connector, but were all interchangeable, but I dont' really know. 1000watt and above motors usually have a larger connector that can handle the increased load without melting. The 8/9 pin I was talking about for the display just goes to a harness that splits into 4 or 5 plugs for the display, brakes, throttle, etc. I think the extra plug on the 9->5 is for headlights. My bike has the 8->4 version, so if I match it I wouldn't need to swap it out. Not a major consideration, but one less thing to do. The final plug on the harness for the display on either is the same 5 pin I think. I guess it's possible Aventon has their own pinouts for each plug, so it may be best to swap out the harness either way. If they switched them around Idk if it would be in the harness or at the controller.
Otherwise, I think the 20A version of Bafangs controller is the way to go. My bike motor is supposed to be rated at 500 watts.
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The stock Aventon says 500W nominal and 750W max.
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So with the Eunorau 20A controller, it will be 480W nominal, 960W max.
I guess you would see some gains?