Samsung NP900X4C-A01US 사용자 설명서

You can view the battery charge status by completing the 

following procedures.

Disconnect the AC adapter and move the mouse cursor over 

the battery icon in the system tray of the Taskbar to confirm the 

remaining battery charge.

A battery is an expendable supply, so when using it over a long 

time, the capacity/battery life is shortened. If the battery life is 

reduced to under half of its initial time, we recommend purchasing 

a new battery.
When not using the battery for a long time, store the battery after 

charging it to 30-40% of its capacity. This extends the battery life 

time.