Sony VGN-TX750P - Manual (Page 28)

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Getting Started
VGN-FJ200 Series models
1 Turn off the computer and close the LCD screen lid.
2 Slide the lock switch (1) to the UNLOCK position.
3 Slide the battery into the battery compartment until it clicks into place.
4 Slide the lock switch (1) to the LOCK position to secure the battery on the computer.
✍
When the 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.