Sony Vaio PCG-FX203K Instruction & Operation Manual page 21

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Using your notebook
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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.
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.