Chapter 3. Explore Your Computer; Manage Power; Check The Battery Status; Charge The Computer - Lenovo ThinkPad X1 User Manual

Chapter 3. Explore your computer

Manage power

Use the information in this section to achieve the best balance between performance and power efficiency.

Check the battery status

The battery status icon
the current power plan, and access battery settings quickly.
Click the battery status icon to display the percentage of battery power remaining and change the power
mode. A warning message is displayed when the battery is low.

Charge the computer

Use ac power
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).
Note: To maximize the life of the battery, the computer does not recharge the battery if the remaining power
is greater than 95%.
Use P-to-P 2.0 charging function
Both Thunderbolt 3 connectors (USB-C) on the computer feature the Lenovo-unique P-to-P 2.0 charging
function. When no ac power is available, this feature enables one computer to supply power to another
computer through a USB-C to USB-C cable. When ac power is available for only one computer, this feature
enables both computers to get charged by ac power.
Before using the function, ensure that:
• The selected connectors support the P-to-P 2.0 charging function and power delivery function.
• Always On USB and Charge in Battery Mode are enabled in UEFI BIOS of both computers, so that the
function works even when the computers are off or in hibernation mode. To enable Always On USB and
Charge in Battery Mode:
1. Enter the UEFI BIOS menu. See "Enter the UEFI BIOS menu" on page 47.
2. Click Config ➙ USB to enable Always On USB and Charge in Battery Mode.
To use the function:
• When no ac power is available:
The remaining battery power of computer A should be at least 30% and be 3% higher than that of
computer B. To check the battery status, see "Check the battery status" on page 31. Connect the
computers to each other with a USB-C to USB-C cable. In this situation, computer A works as the power
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or is in the Windows notification area. You can check the battery status, view
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