Sony VAIO PCG-Z505JE Supplementary Manual page 7

You can display detailed information about the battery in your computer.
The following sections briefly describe how to display your computer's
general battery information. You can also refer to BatteryScope Help for
more detailed information.
Right-click the taskbar at the bottom of the screen.
Select Toolbar from the pop-up menu, and then click BatteryScope.
The BatteryScope appears on the taskbar.
You can also view the total capacity remaining in the battery by
placing the pointer over the battery icon in the task tray on the lower
right side of the screen.
Percentage indicator
Displays the percentage of the remaining capacity.
Time indicator
Displays estimated time (hours/minutes) remaining before the
battery fully drains; also referred to as the time-to-empty.
Charging
Fully Charged
Discharging
No battery