Samsung NP-X11 User Manual page 128

To view through the Control Panel
Select Start > Control Panel > Performance and Maintenance > Power Option >
Power Measure tab.Then you can view the current power source and the current
remaining battery charge.
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.
Power Supply Status
Remaining Battery Charge
System Management 109