Lenovo ThinkPad T550 User Manual page 48

Enabling the battery alarm on the Windows 7 operating system
For the Windows 7 operating system, you can program your computer so that when the battery power falls
below a certain level, three events occur: the alarm goes off, a message is displayed, and the LCD is
turned off.
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 power is low without the alarm
message, the message is displayed when the computer resumes. To resume normal operation, when the
message is displayed, click OK.
Charging the battery
When you find that the remaining battery power is low, charge your battery or replace the removable battery
with a charged battery.
If an ac outlet is convenient, connect the computer to ac power. The battery is fully charged in about
four to eight hours. The actual charging time depends on the battery size, the physical environment, and
whether you are using the computer. 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%.
Tips on charging the battery
• Before you charge the battery, make sure that the temperature is lower than 10°C (50°F).
• 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.
Maximizing the battery life
To maximize the life of the battery, do the following:
• Use the battery until the charge is 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.
Handling the battery
This system supports only batteries specially designed for this specific system and manufactured by Lenovo
or an authorized builder. The system does not support unauthorized batteries or batteries designed for
other systems. If an unauthorized battery or a battery designed for another system is installed, the system
does not charge.
Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and
provides no warranties for failures or damage arising out of their use.
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User Guide