CMOS battery low voltage error on system startup

When starting a computer the following error is shown CMOS Battery Low Voltage. Press F1 to enter Setup ,pressing the key allows you to continue working but after shutting down the system it comes back.
The problem here is probably the CMOS battery that is going bad and it needs to be replaced by opening the computer case and physically removing the battery and installing a new one.

For more info look here:
http://www.computerhope.com/issues/ch000239.htm