Sony VAIO VGN-P500 Series User Manual page 22

3 Fit the battery pack into the battery compartment.
The battery pack should be level with the bottom of the computer.
4 Slide the battery pack toward the front of the computer 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