Dell PowerEdge 650 - Manual (Page 54)

See " Running the System Diagnostics " for information about running the diagnostics and troubleshooting processor problems.
System Battery
The system battery maintains your system's configuration, date, and time information in a special section of memory when you turn off the system. The
operating life of the battery ranges from 2 to 5 years, depending on how you use the system (for example, if you keep the system turned on most of the time,
the battery gets little use, and therefore lasts longer).
You might need to replace the battery if an incorrect time or date displays during the boot routine along with a message about the wrong time, invalid
configuration information, or bad CMOS checksum.
To determine if the battery needs replacing:
1. Re-enter the time and date through the System Setup program. For more information about using the System Setup program, see your User's Guide.
2. Remove the bezel, if applicable. See " Opening the System " in "Troubleshooting Your System."
3. Turn off the system and disconnect it from electrical power for a few hours.
4. After several hours, reconnect the system to a power source and turn it back on.
5. Enter the System Setup program.
If the date and time are not correct in the System Setup program, replace the battery.
You can operate the system without a battery; however, the system configuration information maintained by the battery in SDRAM is erased each time you
shut down the system. Therefore, you must re-enter the system configuration information and reset the options each time the system boots until you replace
the battery. The battery is a 3.0-volt (V) battery.
Replacing the Battery
1. Enter the System Setup program and, if possible, make a printed copy of the System Setup screens.
See "Using the System Setup Program" in the User's Guide.
2. Open the system. See " Opening the System " in Troubleshooting Your System."
3. Locate the battery on the system board. See Figure A -3 for the battery location.
4. Grasp the battery with your fingers and pull up to remove the battery from the battery socket.
5. Place the new battery with the side labeled "+" facing toward the open side of the battery socket. See Figure 6 -9 .
Figure 6-9. Replacing the Battery
NOTE: Some software might cause the system time to speed up or slow down. If the system seems to operate normally except for the time kept in the
System Setup program, the problem may be caused by software rather than by a defective battery.
NOTE: If the system is turned off for long periods of time (for weeks or months), the SDRAM may lose its system configuration information. This loss is
not caused by a defective battery.
CAUTION: See your System Information Guide for complete information about safety precautions, working inside the computer, and protecting
against electrostatic discharge.