Check the battery status
The battery status icon or is in the Windows notification area. You can check the battery status, view
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 battery
When the battery power is low, charge your battery by connecting your computer to ac power.
The battery is fully charged in about two to four hours. The actual charging time depends on the battery
capacity, the physical environment, and whether you are using the computer.
Battery charging is also affected by its temperature. The recommended 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 start recharging the battery if the remaining
power is greater than 95%.
Check the battery temperature
You can check the battery temperature in Lenovo Vantage or Lenovo PC manager.
Step 1. Open Lenovo Vantage.
Step 2. Click Hardware Settings ➙ Power.
Step 3. Locate the Power Status section and then click Show Details to view the battery temperature.
Note: If you’re using Lenovo PC Manager, select System hardware ➙ Battery.
Set power button behavior
By default, pressing the power button puts the computer in sleep mode. However, you can change the
power button behavior in Windows Control Panel.
Step 1. Right-click the battery status icon in the Windows notification area.
Step 2. Select Power Options ➙ Choose what the power button does.
Change or create a power plan
A power plan is a set of power saving settings. You can choose a pre-defined power plan or you can create
your own plans.
Step 1. Right-click the battery status icon in the Windows notification area.
Step 2. Select Power Options ➙ Change plan settings.
Set performance mode
You can press Fn + Q to manually set the computer’s performance mode.
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Lenovo Yoga C640-13IML User Guide
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