Samsung EBE0388137D7 Manual page 9

Checking the battery level
To check the battery level, press and hold the [Ctrl] key (located on the left corner) for 3 seconds.
Depending on the battery level, the indicator flashes as shown below.
Battery level Battery level indicator
Above 80% Flashing three times
80 ~ 20% Flashing two times
Below 20% Flashing one time
6