A cmos battery is what keeps a device from erasing information being given to it, in other words it provides power to any device that has one in it when that device is off.
simply purchase one from where you bought the printer or from any electronic store but keep in mind that there are different sizes so reffer to the printers manual for more information about it at the hp website below for the manual
http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?lang=en&cc=us&contentType=SupportManual&docIndexId=64255&prodTypeId=18972&prodSeriesId=3656598&lang=en&cc=us
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