did you take off all the covers on the bottom? ram extention bays etc. ? it could be tucked under the edge there...
specs link http://support.fujitsupc.com/CS/Portal/supportsearch.do?srch=TECHSPECS drivers link http://support.fujitsupc.com/CS/Portal/supportsearch.do?srch=DOWNLOADS check under the right side of keyboard for a thin rounded rectangle with 2 wires as that is most likely the cmos battery.