Lenovo ThinkPad X240, User Manual

Page: 45 / 181

– How often you use the wireless features.
To check for detailed battery status information, do the following:
• For Windows 7: Start the Power Manager program and click the Battery tab.
• For Windows 8 and Windows 8.1: Start the Lenovo Settings program and click Power .
Using the ac power
The power to run your computer can come either from the battery or from ac power. While you use ac
power, the batteries charge automatically.
Your computer comes with an ac power adapter and a power cord.
• ac power adapter: Converts ac power for notebook computer use.
• Power cord: Connects the ac outlet and the ac power adapter.
Connecting to ac power
To connect the computer to ac power, do the following:
Attention: Using an improper power cord might cause severe damage to your computer.
Note: Ensure that you perform the actions in the order in which they are listed.
1. Connect the power cord to the ac power adapter.
2. Connect the ac power adapter to the power connector of the computer.
3. Connect the power cord into an electrical outlet.
Tips for using the ac power adapter
• When the ac power adapter is not in use, disconnect it from the electrical outlet.
• Do not bind the power cord tightly around the ac power adapter transformer pack when it is connected to
the transformer.
• Before you charge the batteries, make sure that their temperature is at least 10°C (50°F).
• You can charge the batteries when the ac power adapter is connected to the computer. You need to
charge the batteries in any of the following situations:
– When the battery icon in the Windows notification area shows a low percentage of battery power
remaining.
– When the batteries have not been used for a long time
Charging the batteries
When you check battery status and find that the percentage of power remaining is low or when the power
alarm alerts you that the remaining power is low, you need to charge your batteries.
If an ac outlet is convenient, plug the ac power adapter into it, and then insert the connector into the
computer. The batteries will be fully charged in about two to three hours. The charging time is affected by
the battery size and the physical environment. You can check the battery charging status at any time through
the battery-status icon in the Windows notification area.
Note: To maximize the life of the battery, the computer does not start recharging the battery if the remaining
power is greater than 95%.
Chapter 2
.
Using your computer
29