Dell Dimension XPS 50 Reference Manual page 45

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A 3.0-V CR2032 coin-cell battery mounted in a system board socket (see Figure 2-5)
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, perform the fol-
lowing steps.
1. Make a copy of the screens in the system setup program.
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.
2. Remove the computer cover and support beam according to the instructions in
"Removing and Replacing the Computer Cover and Support Beam" found earlier
in this chapter.
3. Locate the battery (see Figure 2-5) and pry it out of its socket with your fingers or
with a blunt, nonconductive object, such as a plastic screwdriver.
4. Insert the battery into the socket with the side labeled "+" facing up (see
Figure 2-12).
Installing Upgrades on the System Board 2-19