Replace CMOS Battery

• 1). Close all running applications and shut down your Dell Latitude D600 laptop. Unplug the power cord from the computer and transfer it to a dust-free work environment.
  
  
• 2). Remove the battery from the laptop by pressing the Battery Release Latch on the back of the computer.
  
  
• 3). Press and hold the reserve battery latch within the main battery compartment and rotate it outwards, exposing the CMOS battery.
  
  
• 4). Pull the battery straight out of the computer, being careful not to damage the wires connecting the battery to the computer.
  
  
• 5). Disconnect the CMOS battery connection from the wire that is connected to the speaker. Set the old CMOS battery aside and connect the new CMOS battery to the wires.
  
  
• 6). Insert the new CMOS battery back into the base of the computer and close the latch by rotating it towards the base.
  
  
• 7). Insert the main battery into the laptop and turn on the computer. You may need to set the time and date, in addition to other custom BIOS settings.