Pull up the clip that holds the battery in place. Lift out the battery. If there is no battery clip, use two fingers to pry the battery out.
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In either case, it should be relatively easy to get the battery out. Do not use excessive force.
Wait 30 seconds to make sure the power to the CMOS is completely drained. Place the battery back into its socket. Turn on the computer. Press 'F1,' 'F2,' 'F12' or 'Del' to enter setup mode. Your BIOS serial number should be changed.
![Change Serial Number Phoenix Bios Updates Change Serial Number Phoenix Bios Updates](http://users.wfu.edu/yipcw/is/t400/issues/images/w500-ati-adatper-property.png)
Note that you'll also lose data on additional drives to connect on startup, any custom BIOS settings, BIOS passwords as well as time and date. Change all the necessary settings, save your changes and reboot.