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Using the ac power
The power to run your computer can come either from the removable battery or from ac power through the
ac power adapter. While you use ac power, the batteries charge automatically.
Connecting the ac power adapter
To connect the ac power adapter, do the following:
Attention: Using an improper power cord might severely damage the 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. Plug the ac power adapter 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 the battery 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
Checking the battery status
Move your pointer to the battery-status icon in the Windows notification area to check the battery status.
The battery-status icon displays the percentage of battery power remaining and how long you can use
your computer before you must charge the battery.
The rate at which you use battery power determines how long you can use the batteries of your computer
between charges. Because of different user habits and needs, it is difficult to predict how long a battery
charge will last. There are two main factors:
• How much energy is stored in the battery when you begin to work.
• The way you use your computer. For example:
– How often you access the storage device.
– How bright you make the computer display.
– How often you use the wireless features.
Charging the batteries
It is recommended that you charge the battery or replace it with a charged battery when the battery power
remaining is low. For example:
• When you find that the percentage of the remaining power is low.
• When the power alarm alerts you.
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ThinkPad P50 User Guide
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