Replacing the battery of your motherboard (CMOS battery)

Symptoms
If your computer is showing the
following symptoms:
Error with date and time options.
You are prompted with the
following error messages:
- bios cmos checksum error
defaults loaded
- bios cmos battery low cmos
- wrong memory size
- no operating system
- CPU overclocking failed
New CPU has been installed and
more..
These problems may be due to
the fact that your CSMOS battery
is depleted and itâ €(TM)s about
time to replace it.
Replacement sequence
It is recommended that you
change the CSMOS battery every
5 years.
Saving the BIOS data
Open all the BIOS screen and
note all the information on a
piece of paper. It's important
that you don't make any
modifications. Once completed
this document will be useful to
check out if all the parameters
are correctly inserted after
replacing the battery.
Identify the CMOS battery
The CMOS battery is some kind of
round shape button, thin in
diameter, sometimes it can be
hidden by extension cards or
connectors or on old PC it has a
cylindrical shape.
The battery model most widely
used is the CR2032:
-Where :
- CR- lithium battery
- 20 - 20mm diameter
- 32- Thickness 32* 0.1 mm
-This type or battery is easily
found and has an average price
of 4 to 5 Euros
How to locate it:
- Turn off your PC
- Remove the power cable
- attached to your System unit and
remove the hatch.
Discharge your System Unit from
static electricity by touching it
with a metallic object.



Removing the discharged
battery
- First of all be sure that your
System unit is laid down
horizontally.
- The +ve pole of the battery
should be visible.
- Remove the battery, but avoid
any forcing and any contact
with other parts of your
motherboard (refer to the
manual provide with your
motherboard).
- Go to your local retailer any buy
a battery of the same model or
something equivalent.
Installing the new battery
Be sure that the battery is place
correctly (firmly) in the slot
allocated (positive side visible,
depending on the model of your
motherboard).
Verify the BIOS data and
resetting the clock
Once the operation complete, it is
important to configure the BIOS
settings.
- Start your PC.
- Enter the BIOS.
- Modify the Date.
- Verify if the parameters are the
same as the one noted in step
1(perform any modifications
needed)
- Save and quit BIOS.

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