Dell PowerVault 715N Service Manual page 32

6. Replace the system
7. Reconnect the system to the electrical outlet, and then turn on the system power.
8. Enter the BIOS Setup utility
9. Enter the correct time and date through the BIOS Setup utility's Standard CMOS Setup settings.
Also, re-enter any system configuration information that is no longer displayed on the BIOS Setup screens, and
then exit the BIOS Setup utility.
10. To test the newly installed battery, shut down and disconnect the system from the electrical source for at least an
hour.
11. After an hour, connect the system to an electrical source and turn on the power.
12. Enter the BIOS Setup utility
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to confirm that the battery operates properly.
and if the time and date are still incorrect, replace the system board.