Sony VGN S400 Series User Manual page 26

VGN-T300 Series models
1 Turn off your computer and close the LCD screen lid.
2 Slide the battery into the battery compartment until it clicks into place.
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.
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Getting Started