Power input through a USB-C port

The USB-C port 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 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 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 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 and 20 V, 5 A	Capable of charging the computer
20 V, 2.25 A and 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

CAUTION:

When purchasing third-party USB-C chargers for use with the computer, choose a product that is safety approved or certified. A disqualified charger may cause damage to your computer or pose an electrical hazard. In many countries and regions, manufacturers or importers of electric chargers can submit their products to a certification authority or approved and recognized testing laboratories. Such a product usually carries a mark if it was tested to pass relevant quality and safety standards. For some countries and regions, this certification process is even mandatory. If you live in mainland China, choose a charger with the “CCC” mark; for users in many European countries, choose one with the “CE” mark; for users in the United States and Canada, choose a Listed charger that carries a mark by one of the Nationally Recognized Testing Laboratories. (For example, the “UL Listed”mark). For people living in other countries and regions, consult a qualified electrical engineer for how to select a safety approved electric charger.

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 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.