Lenovo ThinkPad T540p - Manual (Page 42)

1. Connect the power cord to an electrical outlet.
2. Connect the power cord to the transformer pack.
3. Connect the ac power adapter to the ac power connector of the computer.
Tips on 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 battery, make sure that its temperature is at least 10°C (50°F).
• You can charge the battery when the ac power adapter is connected to the computer and the battery is
installed. You need to charge the battery in any of the following conditions:
– A new battery is installed.
– The percentage of power remaining is low.
– The battery has not been used for a long time.
Charging the battery
When you 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 battery or replace it with a charged battery.
If an ac outlet is convenient, plug the ac power adapter into it, and then connect the ac power adapter to
the computer. The battery will be fully charged in about three to six hours. This 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%.
Maximizing the battery life
To maximize the life of the battery, do the following:
• Use the battery until the charge is completely depleted.
• Recharge the battery completely before using it. You can see whether the battery is fully charged from the
battery status icon in the Windows notification area.
• Always use power management features such as power-saving modes.
Managing the power plans
To achieve the best balance between performance and power saving, adjust your power plan settings.
To access power plan settings, do the following:
1. For Windows 7: Start the Power Manager program and then click Power Plan or Advanced ➙ Power
Plan. For instructions on how to start the Power Manager program, see “Accessing Lenovo programs on
the Windows 7 operating system” on page 14.
2. For Windows 8 and Windows 8.1: Right-click the battery status icon in the windows notification area
and click Power Options, click Change plan settings that is next to your power plan.
For more information about the Power Manager program, refer to the help information system.
26 User Guide