c.  Remove any parts and disconnect any cables that might impede your access to the CMOS 
battery.
Step 2.  Locate the CMOS battery. See 
“System-board-assembly connectors” on page 30.
Step 3.  Remove the CMOS battery. 
Attention: 
•  Differentiate between the positive and negative ends of the battery socket as shown below.
•  Failing to remove the CMOS battery properly might damage the socket on the processor board. 
Any damage to the socket might require replacing the processor board.
•  Do not tilt or push the CMOS battery by using excessive force.
Figure 35. Removing the CMOS battery
a.  Lever the CMOS battery from the socket with a flat blade screwdriver.
b. 
Remove the CMOS battery.
After you finish
1.  Install a new one. See “Install the CMOS battery” on page 79.
2.  Dispose of the CMOS battery as required by local ordinances or regulations.
Demo video
Watch the procedure on YouTube
Install the CMOS battery
Follow instructions in this section to install the CMOS battery.
Chapter 5. Hardware replacement procedures 79