Sony VGN-UX180P - Manual (Page 24)

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Getting Started
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When the battery is running out of power, both the battery and power indicator lights blink.
Keep the battery pack in the 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 or shut down the computer and install a fully charged
battery.
The battery pack supplied with the 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, both the battery and power
indicator lights start flashing.
For some software applications and some peripheral devices, the 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 Standby or
Hibernate. If the battery wears out when the computer enters Standby 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 the computer is directly connected to AC power and has a battery pack installed, it uses power from the AC outlet.