Dell PowerEdge 2550 - Manual (Page 74)

You can operate the system without a battery; however, the system configuration information maintained by the battery in NVRAM 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), coin-cell CR2032-type battery. To remove the battery, perform the following steps.
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 for instructions.
2. Shut down the system, including any attached peripherals, and disconnect the system from the electrical outlet.
3. Open the system doors (see " Opening the System Doors " in "Checking Inside the System").
4. To remove the battery, pry the battery out of its socket with your fingers or with a blunt, nonconductive object such as a plastic screwdriver.
5. Install the new battery with the side labeled "+" facing up (see Figure 8 -15 ).
Figure 8-15. Installing the Battery
6. Close the system doors, reconnect the system and peripherals to their electrical outlets, and turn them on.
7. Enter the System Setup program to confirm that the battery is operating properly.
8. Enter the correct time and date through the System Setup program's Time and Date settings. Also re-enter any system configuration information that is
no longer displayed on the System Setup screens, and then exit the System Setup program.
9. To test the newly installed battery, turn off and disconnect the system from the electrical outlet for at least an hour.
10. After an hour, plug in and turn on the system and enter the System Setup program. If the time and date are still incorrect, see " Getting Help " for
instructions on obtaining technical assistance.
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WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its electrical outlet. For more information, see
"
Safety First—For You and Your Computer " in "Checking Inside the System."
WARNING: There is a danger of a new battery exploding if it is incorrectly installed. Replace the battery only with the same or equivalent type
recommended by the manufacturer. Discard used batteries according to the manufacturer's instructions.
WARNING: See "Protecting Against Electrostatic Discharge" in the safety instructions in the System Information document.