Dell PowerEdge FC630 Owner's Manual page 141

If the date and time are not correct in the System Setup, replace the battery. If the problem is not
resolved by replacing the battery, see the Getting help section.
NOTE: If the sled is turned off for long periods of time (for weeks or months), the NVRAM may
lose its system configuration information. This situation is caused by a defective battery.
NOTE: Some software may cause the sled's time to speed up or slow down. If the sled operates
normally except for the time maintained by the System Setup, the problem may be caused by a
software rather than by a defective battery.
Related Links
Getting help
Removing the sled
Installing the sled
Replacing the NVRAM backup battery
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