Sony Vaio VGN-Z Series, User Manual

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Getting Started
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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 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.
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 the battery life.
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 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.