COMS battery checking

Actually CMOS is not a battery ,it is a technology which is used to construct Integrated Circuit. CMOS stands for Complementary Metal Oxide Semiconductor. This technology is basically used in microprocessor, micro-controller,RAM ,different logic circuit.
To check the CMOS battery we have to take following steps:

1. Remove the CMOS battery from the motherboard.
2. Set the multimeter in DC voltage mode
3. Put the red probe on +ve side (mentioned on the CMOS battery) and black probe on opposite side of the CMOS battery.
4. If the output voltage shown is grater than 2.5 volts on  multimeter then it is OK otherwise replace the battery.

Thanking You