Samsung NP-X1 User Manual page 130

Using the battery
Battery is an expendable supply, so when you use it for a long time, the
capacity/battery life is shortened. If the battery life is reduced to under half of
the initial time, we recommend that you purchase a new battery to use.
Battery Warning
You will hear an alarm when the remaining battery charge is under 10%.
Connect the power cable or turn off the computer and install a fully charged
battery.
When the remaining battery charge is under 3%, the computer automatically
saves current work and turns off. This may be different according to the
settings in Control Panel > Performance and Maintenance > Power
Options > Alarms tab.
Extending the battery use time
Decreasing the LCD Brightness
Decreasing the LCD brightness by pressing the <Fn>+<
keyboard or adjusting the brightness in the Battery Manager program extends the
battery use time. (Refer to 'Adjusting LCD Brightness' (p14))
Decreasing the LCD brightness by one level extends the battery use time by 3~5%
(10~20 minutes). (The battery use time is determined by the corresponding model.)
Using the Battery Manager
Battery Manager is a power management program that enables using battery power
efficiently.
You can easily change the power mode by selecting an optimized power mode and
manually optimizing the battery use time by setting each option.
> key combination on the
System Management 111