Dell PowerVault 725N (Rackmount NAS Appliance) - Manual (Page 41)

Replacing the 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 utility. For more information on using the utility, see your User's Guide.
2. Turn off the system and disconnect it from electrical power for a few hours.
3. After several hours, reconnect the system to a power source and turn it back on.
4. Enter the System Setup utility.
If the date and time are not correct in the System Setup utility, 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.
To replace the system battery, perform the following steps:
1. Enter the System Setup utility and, if possible, make a printed copy of the System Setup screens.
See "Using the System Setup Utility," in the User's Guide for instructions about using the utility.
2. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.
3. Remove the system cover. See " Removing and Replacing the System Cover ."
4. Locate the battery on the system board. See Figure 5 -1 for the battery location.
5. Grasp the battery with your fingers and pull up to release the battery from the battery socket.
6. Place the new battery with the side labeled "+" facing toward the open side of the battery socket. See Figure 5 -11 .
Figure 5-11. Replacing the Battery
7. Replace the system cover, and then reconnect the system and peripherals to the power source and turn on the system.
8. Enter the System Setup utility to confirm that the battery operates properly.
9. From the main screen, select System Time to enter the correct time and date.
Also, re-enter any system configuration information that is no longer displayed on the System Setup screens, and then exit the System Setup utility.
10. To test the newly installed battery, turn off the system and disconnect it from electrical power for at least an hour.
NOTE: When you turn on the system, press the power button for less than two seconds. If you press the power button for longer than 3 seconds,
the NAS system shuts down and automatically rebuilds its RAID arrays, which could impact system performance for several hours.
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 utility, 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.
NOTE: When you turn on the system, press the power button for less than two seconds. If you press the power button for longer than 3 seconds,
the NAS system shuts down and automatically rebuilds its RAID arrays, which could impact system performance for several hours.