How do you remove cmos battery from hp pavilion dv2 notebook?

To remove the CMOS battery from an HP Pavilion dv2 notebook, first, power off the device and disconnect it from any power source. Open the back cover by unscrewing the screws and carefully lifting it off. Locate the CMOS battery, which is typically a coin-cell battery; gently disconnect it from its socket. Replace it with a new battery if necessary, then reassemble the notebook.