Sony VAIO PCG-F400 User Manual page 23

Using Your Notebook Computer
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Connecting a Power Source
For some software applications and some peripheral devices, your computer may not enter
system hibernation mode when battery life is low. To avoid loss of data when using battery
power, you should save your data frequently and manually activate a power management
mode, such as system suspend or system hibernation.
When the battery is running out of power, both the battery and power indicators blink.
To determine the time the battery lasts, please refer to "Displaying Battery information" in
your Software Guide.
See "Using a second battery pack" for information on installing and charging a battery
pack in the multi-purpose bay.
Keep the battery pack in the computer while it is directly connected to AC power. The
battery pack continues to charge while you are using the computer.
If the battery level falls to below 10%, you should either attach the AC adapter to recharge
the battery or shut down your computer and insert a fully charged battery.
You can extend battery life by changing the power management modes in the PowerPanel
utility. See your Software guide, in "Controlling Power Management".
The battery pack supplied with your computer is a lithium ion battery and can be recharged
at any time. Charging a partially discharged battery does not affect battery life.
The battery indicator light is on while you use the battery pack as a power source. When
battery life is nearly depleted, the battery indicator starts flashing.