Other - Sony PCG-XG18 Primary User Manual

You can use either AC power or a rechargeable battery pack as a power
source.
Slide the LCD lock lever in the direction of the arrow as indicated
below, and lift the cover. The bottom portion of the computer lifts
automatically and the back connectors appear.
Plug the cable attached to the AC adapter into the DC In connector on
the computer.
Plug one end of the power cord into the AC adapter.
Plug the other end of the power cord into an electrical outlet.