The battery pack can be charged even while you are using your VAIO computer
when the computer is connected to a power source. The charging time may vary
depending on operating conditions.

Extending the Battery Life

When your VAIO computer is running on battery power, you can extend the
battery life using the following methods.

About Sleep Mode

Sleep mode enables you to take a break and retain the computer’s state,
including data you are working on.

Changing the Rapid Wake (Sleep Mode) Settings

You can change the Rapid Wake settings in VAIO Control Center.

Checking the Battery Charge Capacity

The battery pack is consumable. The capacity gradually declines through
repeated cycles of recharging and discharging. As a result, the battery life
becomes short even if it is fully charged and eventually the battery pack reaches
the end of its life.

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You might be looking for the following topics:

Notes on Using the Battery Pack
Installing the Battery Pack
Removing the Battery Pack
What should I do if a message appears indicating that the battery pack is

incompatible or has been incorrectly installed, after which my VAIO computer

enters Hibernate mode?
Why cannot I fully charge my battery pack?
Why is my VAIO computer running slowly and the CPU clock frequency low

while the computer is running on battery power?

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This manual is related to the following products:

Vaio SVF1521