Removing, Installing, and Replacing Components 31
Replacing the Lithium Battery You may need to replace the lithium battery if your computer consistently
loses the date or time settings after turning it off. The lithium battery has
a typical life of three years, after which the battery may be too weak to
power the CMOS memory.
1Reboot your computer by selecting Shut Down... from the Start
menu, and then selecting Restart the computer.
2If the error message “Error: Check date and time settings”appears
during the reboot sequence, press F2 during the reboot process to
access the BIOS Setup Utility. Otherwise it is not necessary to replace
the battery at this time, and you can skip all remaining steps.
3Compare all the BIOS options to their default settings (see “CMOS
Setup Options” on page 75). Make a list of all the BIOS options that
are different from their default values. You will refer to this list when
you restore the BIOS settings later.
4Select Exit Discarding Changes from the main menu using the right
arrow key.
5Press Enter, type Y when prompted to discard changes, then press
Enter to exit the BIOS Setup Utility.
6Turn off the computer and unplug the power cord.
7Remove the cover (see “Removing the Cover” on page 22).
!When you remove the lithium battery, all values stored in the CMOS mem ory
(BIOS setup values and Plug and Play values) may be lost. Although the
computer can hold the charge for a short time while replacing the battery, it
is safer to assume that the setti ngs w ill be l ost. W h en the valu es are l ost, the
BIOS values revert to their factory-default settings (see “Accessing the BIOS
Setup Utility” on page 16).
Do not handle damaged or leaking batteries.
The lithium battery may explode if mistreated . Do not disassemble it or
dispose of it in fire.