Turn off the computer, or enter hibernation mode. Then disconnect the AC adapter and all cables from the computer. Note: If you are using a PC Card, the computer may not be able to enter hibernation mode. In such a case, turn off the computer.
Close the computer display, and turn the computer over.
Unlock the battery latch by sliding it to the left  until the battery rises. Then remove the battery .
Align the front of a fully charged battery with the front side of the battery space, and gently push until you hear a click.
Make sure that the battery latch is in the locked position.
Turn the computer over again. Connect the AC adapter and the cables to the computer.