Using The Ac Power; Charging The Battery - Lenovo ThinkPad E450 User Manual

To enable the battery alarm, do the following:
1. Start the Power Manager program.
2. Click the Global Power Settings tab.
3. For Low battery alarm or Critically low battery alarm, set the percentage of the power level and set
the action.
Note: If your computer enters sleep or hibernation mode when the battery is low, but the alarm message
has not yet been displayed, the message will be displayed when the computer resumes. To resume normal
operation, when the message is displayed, click OK.

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 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 insert the connector into 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.
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Chapter 2 Using your computer
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