Dell Dimension XPS D Series Reference And Troubleshooting Manual page 43

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A 3.0-V CR2032 coin-cell battery mounted in a system board socket (see Figure 2-4)
maintains system configuration, date, and time information. The battery can last sev-
eral years.
NOTE: Leave your power strip turned on when the computer is turned off to extend
battery life.
If the battery expires, the system loses the system configuration information when-
ever it is disconnected from power. If you have to repeatedly reset this information
after turning on the system, replace the battery.
To replace the system battery with another CR2032 coin-cell battery, follow these
steps.
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You will need a written or printed copy of the system configuration information to
restore the correct settings later. Refer to Appendix B, "System Setup Program,"
for instructions.
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Installing Upgrades on the System Board 2-17