Replace BIOS battery

Open the latch on the right side that secures the battery in place.

Open the latch on the left side that secures the battery in place.

Now remove the battery.

Use the Philips screwdriver to remove the two screws on the bottom cover.

Check the markers to determine how to remove the cover.

Now remove the cover as prescribed by the markers.

The components HDD hard disk and BIOS battery are now visible.

Pull out the plug of the battery first.

Then carefully remove the battery (attention glue).