Remove the screws marked below:
Open the lid as shown below and use a screwdriver to pull the plastic off the clip
You should now have removed the top plastic cover with the buttons on it.
Now remove the other screws to be able to remove the bottom plastic cover with the touchpad area
Here you can see the BIOS battery. Lift the keyboard and carefully lift the bronze sheet metal piece. (If you own the E7110, you need to remove a screw near the Firewire-port to be able to bend the metal sheet up. Thanks to Maris F. for this hint.)
Pull out the small plug and wait about a minute.