Sony VGN-SZ440 - Manual (Page 25)

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Getting Started
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When the battery pack is running out of power, both the battery and power indicator lights blink.
Keep the battery pack in your 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 below 10%, you should either attach the AC adapter to recharge the battery pack or shut down your computer and install a fully
charged battery pack.
The battery pack supplied with your computer is a lithium ion battery pack and can be recharged any time. Charging a partially discharged battery pack
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, both the battery and power
indicator lights start flashing.
For some software applications and some peripheral devices, your computer may not enter Hibernate mode even 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 Sleep or Hibernate.
If the battery pack wears out when the computer enters Sleep mode, you will lose any unsaved data. Going back to the previous work state is impossible.
To avoid loss of data, you should save your data frequently.
When your computer is directly connected to AC power and has a battery pack installed, it uses power from the AC outlet.