Sony VGN-UX490N - Manual (Page 27)

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Getting Started
Using the Battery Pack
The battery pack supplied with your computer is not fully charged at the time of delivery.
Installing the Battery Pack
To install the battery pack
1 Turn off the computer.
2 Slide the battery pack into the battery compartment until it clicks into place.
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When your computer is directly connected to AC power and has a battery pack installed, it uses power from the AC outlet.
!
This computer is designed to operate only with genuine Sony batteries.