Sony Vaio VGN-BX600 Series User Manual page 23

4 Rotate the battery in the direction of the arrow, and push the battery down into the compartment until it clicks into place.
5 Slide the battery LOCK/UNLOCK switch to the LOCK position to secure the battery 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 batteries.
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Getting Started