What happens when you connect two laptops through a USB-C port, provided both are able to charge through it?
Is that intended to be used like that? Can I transfer some juice from laptop A to laptop B?
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The depends entirely on the capabilities programmed in to the USB controllers of the laptops. Or, at least programmed in to one of them.
First, the laptops have to be able to charge themselves from USB-C, which is pretty normal.
Second, one of the laptops will have to support charging a different device over USB-C.
Many laptops support this, but they only send a relatively small charge out over the USB ports rather than the much higher current the power supply uses to charge the laptops themselves.
At very least, you can use a normal USB-3 to USB-C connector (like most Android phones have) to connect the laptop you need to charge to the charge-indicated port on the other laptop.
It typically will NOT be necessary to have male-to-male USB-C cables to do this.
HOWEVER, as noted, unless one of the laptops explicitly supports charging another laptop, it is very likely you will NOT be able to send enough energy to do anything but SLOWLY charge the laptop, and you will NOT generate enough energy to run the laptop from the USB of the other laptop.