Lenovo 20JW, User Manual, Page: 42 / 176

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, click OK
when the message is displayed.
Charging the battery
When you find that the remaining battery power is low, charge your battery or replace the 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, ensure that the battery 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.
Managing the battery power
To achieve the best balance between performance and power saving, adjust your power plan settings.
To adjust power plan settings, do the following:
1. Go to Control Panel, and then change the view of Control Panel from Category to Large icons or Small
icons.
2. Click Power Options .
3. Follow the instructions on the screen.
For more information, see the Windows help information system.
Power-saving modes
There are several modes that you can use at any time to conserve power. This section introduces each
mode and gives tips on the effective use of battery power.
• Screen blank mode (for Windows 7 only)
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T570 and P51s User Guide