Power input through a USB-C port

The USB-C port on the rear side of your computer supports power input up to 20 V and 5 A. Some external devices, such as a dock or display, may include a USB-C port that supports power output greater than 20 V and 2.25 A. If such a device is connected to this rear USB-C port, it is capable of providing power to your computer.

a dock and an external display connected through a USB-C cable to the rear USB-C port that also provide power to the PC

In another scenario, if you carry your computer around without the included ac power adapter, you may use a capable USB-C charger to provide power through the rear USB-C port. In both scenarios, the output power of a USB-C charger or the USB-C port on a dock or display should be at least 20 V and 2.25 A in order to provide power to your computer. The following table lists the charging capability of a USB-C port on a charger or an external device based on its maximum output power.

Table 1. Maximum output power of a USB-C port and its capability of charging the computer
Maximum output power of a USB-C port	Capability
20 V, 3.25 A or greater	Capable of charging the computer
20 V, 2.25 A or greater, but less than 20 V, 3.25 A	Capable of charging the computer in sleep, hibernation, or powered-off state
Less than 20 V, 2.25 A	Cannot provide power to the computer or charge the battery

Note: If the computer is already connected to an electrical outlet using the included power adapter, the computer will not receive power through the USB-C port.

The rear USB-C port is not designed as the primary power input port. If it is used as the only external power source, the computer may not operate at its full capacity and battery charging may be longer than expected. Whenever possible, use the included ac power adapter to provide power to your computer.