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 or CF Card, the computer may not be able to enter hibernation mode. If this happens, turn off the computer.
Close the computer display, and turn the computer over.
Slide and hold the battery latch to the unlock position (1); then remove the battery (2).
Align the front of the spare battery with the front side of the battery space in the computer (3); then gently push the battery into the space (4).
Slide the battery latch to the locked position.
Turn the computer over again. Connect the AC adapter and the cables to the computer.