Battery pack removal and installation - 3000 V100, V200
Turn off the computer, or enter hibernation mode. Then disconnect the AC adapter and all cables from the computer. Note: If you are using an ExpressCard, 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 [1] to the unlocked position.
Unlock the battery latch [2] by sliding it to the unlocked position. Holding the latch in the unlocked position, remove the battery [3].
Install a fully charged battery [1].
Slide the battery latch to the locked position [2].
Turn the computer over again. Connect the AC adapter and the cables to the computer.