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##### Replacing the CMOS Battery (CRU)

Use this procedure to replace the system battery when it has failed, or you can use this procedure to reset the battery-backed CMOS–based BIOS settings to the default values. (For more information about resetting the CMOS, see Clearing the Sun Fire X4640 Server CMOS Settings.)

| Caution - Replacing the system battery erases all custom BIOS settings and loads the factory default values.

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