How to change mainboard battery? - Fujitsu Siemens JETSON POWER (J815-E2F) PC Desktop

Most PC users don't think much about the CMOS battery until their computer shows signs of losing its BIOS settings on boot up. If you tend to upgrade rather than replace your PC, replacing the CMOS battery every couple of years makes sense.
Likewise, if you purchase a used PC, battery replacement is a good idea unless the PC is less than two years old. It's just one more preventive step you can take to prevent troubles in the future.
If you have never replaced a CMOS battery before, you can find step-by-step instructions below.
In most cases, frequent CMOS errors are a sign of a dead battery. The CMOS battery maintains your settings while your PC is powered off. You can easily replace the battery yourself.


Instructions:

1. Boot your PC and enter its setup mode.
   
2. Write down all of the settings from the various BIOS menus. Click this link to learn more about this procedure.
   
3. Power off your PC.
   
4. Open the case of your computer
   Figures 1-2. Undoing the screws onHow to change mainboard battery? - cmosreplace_3.jpg Figure 3. Opening the case of your PC.
5. How to change mainboard battery? - cmosreplace_4.jpgy on the motherboard.
   Figure 4. Battery location on the motherboard. The layouts of the components differ on different motherboards, so you'll have to consult your motherboard user manual for specifications about the battery and its locHow to change mainboard battery? - cmosreplace_5.jpgis is a close-up view of the battery on the motherboard.
   Figure 5. Typical CMOS battery. The most common type of batteries used in modern PCs is coin-shaped lithium/manganese-dioxide battery that looks like a large watch battery.
   
6. Obtain a replacement How to change mainboard battery? - cmosreplace_6.jpgcal or online computer parts dealer.
   
7. Remove the old battery.
   
8. Replace it with the new one, as shown on the picture below.
   Figure 7. Replacing the battery.
9. Document the date of replacement for future reference.
   
10. Replace the case and power on the PC.
    
11. Enter the setup mode of your PC.
    
12. Reenter the settings you have written down from the various setup menus.
    

1. Don't forget to observe proper anti-static precautions when working inside the case of your PC.
   
2. If you can't see your battery right away, try removing expansion cards or unplugging cables. The majority of newer motherboards use lithium batteries that look like large watch batteries.
   

Start by disconnecting everything, put it on a table with plenty of space to work in.

Take off the side/top & side cover, lie it down and look at the main board, you should see a round flat liion battery bright silver finish. Usually designated CR2032 but check and have a replacement ready first.

Here's a pretty good youtube video to show you how to go about it.

http://www.youtube.com/watch?v=r4fDSQap2Qo