Dell Precision 420 - Manual (Page 17)

you may damage the system board by prying off the socket or by breaking circuit traces on the system board.
Pry the battery out of its socket with your fingers or with a blunt, nonconductive object, such as a plastic screwdriver (see Figure 10).
Figure 10. System Battery and Battery Socket
6. Install the new battery.
Orient the battery with the side labeled "+" facing up. Then insert the battery into the socket, and snap it into place.
7. Rotate the power supply back into position, making sure that the securing tab snaps into place.
8. Replace the computer cover, and reconnect your computer and peripherals to their electrical outlets and turn them on.
9. Enter the System Setup program , and confirm that the battery is operating properly.
Enter the correct time and date through the System Setup program's Time and Date options. Also, restore the correct settings for the system
configuration information using the copy made in step 1.
10. While in the System Setup program, reset the chassis intrusion detector by changing Chassis Intrusion to Enabled or Enabled-Silent.
11. Turn off your computer, and unplug it for at least 10 minutes.
12. After 10 minutes, plug in and turn on the computer and enter the System Setup program. If the time and date are still incorrect, see " Getting
Help ."
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1 Battery
2 Battery socket
NOTE: After you remove and replace the cover, the chassis intrusion detector will cause the following message to be displayed at
the next system start-up:
ALERT! Cover was previously removed.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting
the chassis intrusion detector.