Sony VAIO PCG-FX201 User Manual page 21

Using your notebook
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When the battery is running out of power, both the battery and power indicators blink.
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.
The battery pack supplied with your computer is a lithium ion battery and can be recharged 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 the battery life is nearly depleted, the battery indicator starts
flashing.
For some software applications and some peripheral devices, your computer may not enter Hibernate 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 Standby or
Hibernate.
When the computer is directly connected to AC power and has a battery pack inserted in the battery bay, it uses power from the AC outlet.