Computer Losing date and Time
If
your computer is losing date and time after it’s powered off,
the most likely cause is the CMOS battery failing.
This can also
be followed by errors on bootup such as CMOS checksum error
which confirms an issue with the battery.
The CMOS
battery is very small usually a coin size type. It is used to
store all setting information including the date and time.
When the battery is exhausted
all settings information will be lost each time the computer is
powered off and unplugged from the mains.
If the computer has not been used for a few months, powering it
on and leaving it on for a period of around 24 hours may fix
this.
Otherwise the
CMOS battery will need to be replaced.
In desktop
computers the CMOS battery is usually very easy to find and
replace, but laptops can be a specialised job as it can be very
difficult to find let alone access and replace.
Once you’ve located the battery obtain all of the
information written on it, if possible remove it and take it
with you when purchasing a replacement to ensure compatibility.
If ordering online you may only need to specify your
computer make and model to find the correct battery.
When
attempting to remove the battery make sure you are well earthed
to reduce the chance of ESD or Electro Static Discharge which
can easily damage electronic components, such as motherboards.
You can read more on helping to
prevent ESD damage here.
To remove the
battery, unclip or gently prise it free, it should then life or
flip out.
On older
generation computers the battery may be very similar to an older
type camera battery, it also worth noting some manufacturers
soldered the batteries in place, so you may need to find someone
who is handy with a soldering iron to replace this type.
When fitting
the new battery you’ll need to setup the CMOS settings one more
time.
 CMOS batteries are usually expected to last around 5
years, but they usually last longer depending on how the
computer is used and if it is left plugged into the electrical
mains supply.
If replacing
the battery does not stop your
computer from
losing date and time check to make sure the connections from the
motherboard to the battery are not tarnished. If it is still
losing CMOS settings after checking this, the issue may be a
problem with the motherboard itself.
Motherboard hardware problems are generally not cost efficient
to repair, so replacing is usually the best way to resolve this.
If your computer is losing date and time
Checkout our other computer hardware guides
Need to replace CMOS battery ? WAIT!!
Make sure your aware of ESD and how you can protect your
computer before performing any hardware maintenance
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