
So yeah, be it data transfers or connecting to an external display, this one does them all without breaking a sweat. More importantly, this cable works as advertised. The braided exterior adds to the durability of the product and at the same time prevents the cable from splitting and fraying, something that is common with Apple’s cables. Yes, unlike most other cables that Apple gets the flak for, this is a braided cable, and the strain relief is long enough for you to position your fingers properly over them. However, this will have no impact when connecting the MBP to itself, beyond what I stated at the beginning of my answer.If you want to play it safe, you can check Apple’s official Thunderbolt 3 Pro cable. In the case of your MBP, it can power one device that uses up to 15 watts and one device that uses up to 7.5 watts. It doesn't matter which side of your MacBook Pro that they're connected to-power is delivered on a first-come, first-served basis.


Your MacBook Pro draws power from only one power supply, even if more than one is attached-so using multiple power supplies won't.In other words, plugging a USB-C cable between two of its ports will have no effect. If the MBP is plugged into AC power - In this scenario, the MBP will automatically accept the charge from the AC outlet source, rather than any other source.If the MBP is not also plugged into AC power - In this scenario, it's not a good idea as the MBP will slowly lose power faster than it would if the cable wasn't plugged into both ports.

Basically, what happens to your MBP will depend on which of the following scenarios is true: There isn't any risk in doing this, but it'd be a self-defeating practice.
