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Open keyboard up . Remove Floppy and battery pack. To the left side of the case you should see 2 batteries. If not, there is an insulator cover that flips up. One battery will be obvious and consists of 3 cells . This is NOT the one you want (grin) The Backup battery is usually under a rectangular piece of plastic the might be held in place by a screw. Remove it and you should see a thick quarter sized battery. Pull it away from the circuit board i.e. unplug it. Measure the voltage. It should be 2.5 to 3.7 volts according to the HMM. If it's not replace it ..either Radio Shack by cross referencing the part number on the cell or talk to IBM parts. part # 84G2263. . The 3rd party route requires soldering the wires from the old onto the new. http://www.direct.ibm.com/cgi-bin/ncommerce/;display/category?cgmenbr=1&cgrf nbr=608 shows a price of $6.50 ..peter Subject: Thinkpad 750 clock losing track of time at power on >Hope you don't mind me asking but my Thinkpad keeps forgetting the date & >time. Every start up it begins with error and asks for the date & time. >I can't understand why it does this. I went into Norton Utiities DOS ans it >said that the C-Mos battery was operational, I spose it could be lying. >Have you any ideas where to go from here? >