Sony VAIO VGN-FW200 User Manual page 23

4 Rotate the battery pack in the direction of the arrow, and push the battery pack down into the compartment until it clicks
into place.
5 Slide the battery LOCK switch outward to secure the battery pack on the computer.
✍
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 battery packs.
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Getting Started