Sony VAIO VGN-CS - Manual (Page 24)

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Getting Started >
Using the Battery Pack
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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 charge level falls below 10%, you should either connect the AC adapter to recharge the battery pack or shut down your computer and
install a fully charged battery pack.
Your computer is supplied with a lithium ion battery pack and can be recharged any time. Charging a partially discharged battery pack does not affect
the life of battery.
While some software applications or peripheral devices are in use, your computer may not enter Hibernate mode even when the remaining battery life
is short. 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 all 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.