Sony VGN-UX490N - Manual (Page 30)

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Getting Started
Removing the Battery Pack
!
You may lose data if you remove the battery pack while your computer is on and not connected to the AC adapter or if you remove the battery pack
while the computer is in Sleep mode.
To remove the battery pack
1 Turn off the computer.
2 Slide the battery release latches (1) inwards, hold the latches, and slide the battery pack away from the computer.