Charge the computer

When the battery power is low, charge your battery by connecting your computer to ac power.

The battery is fully charged in about four to eight hours. If the power adapter shipped with your computer supports the rapid charge function, the battery is 80% charged in about one hour when the computer is turned off. The actual charging time depends on the battery size, the physical environment, and whether you are using the computer.

Battery charging is also affected by the battery temperature. The recommended battery temperature range for charging the battery is between 10°C (50°F) and 35°C (95°F).

Use P-to-P 2.0 charging function

Both the USB-C connectors (USB 3.1 Gen 2) on the computer feature the Lenovo-unique P-to-P 2.0 charging function, which enables one computer (A) to supply power to another computer (B) through a USB-C to USB-C cable when no ac power is available.

To use the function, ensure that:

• The selected connectors support the P-to-P 2.0 charging function and power delivery function.

• The battery power remaining of computer A is at least 30% and is 3% higher than that of computer B. In this situation, computer A work as the power supply. Once the battery power remaining of computer A is lower than 30%, it stops supplying power to computer B. To check the battery status, see Check the battery status.

• If one computer is off, in sleep mode, or hibernation mode, enable the Always On USB feature in UEFI BIOS in the computer. To enable the Always On USB feature:

  1. Enter the UEFI BIOS menu. See Enter the UEFI BIOS menu.

  2. Click Config > USB > Always On USB to enable the Always On USB feature.