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The battery they refer to is known as the cmos battery, it keeps power to the cmos chip to retain any custom bios settings and such....like the date and time. If the cmos battery falls below 3V then the machine looses the ability to keep the proper date and time and usually on boot will post to default values of the bios and ask for them to be set. Changing a cmos battery on a desktop is relatively easy, on a laptop it could require partial disassembly of the machine to gain access to the motherboard where the battery is. You can check the Dell support site and see if they have any articles pertaining to the cmos battery replacement or take it to a repair shop and have them do it for you. Typically on a desktop the battery is a cr2032...about $6 at radioshack or walgreens on a laptop I'm not sure exactly which battery is common.
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