About The Battery; Removing The Battery - Dell Precision 390 User Manual

1 heat-sink assembly 2 heat-sink assembly bracket
11. Replace the computer cover. See
NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug the cable into the computer.
12. Connect your computer and devices to electrical outlets, and turn them on.
Battery
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
CAUTION: A new battery can explode 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.
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer.

About the Battery

A coin-cell battery maintains computer configuration, date, and time information. The battery can last several years.
The battery may need replacing if you have repeatedly reset the time and date information after turning on the computer or if one of the following messages
appear:
Time-of-day not set - please run SETUP program
or
Invalid configuration information -
please run SETUP program
or
Strike the F1 key to continue,
F2 to run the setup utility
To determine whether you need to replace the battery, re-enter the time and date in system setup and exit the program to save the information. Turn off your
computer and disconnect it from the electrical outlet for a few hours; then reconnect the computer, turn it on, and enter system setup (see
Setup). If the date and time are not correct in system setup, replace the battery.
You can operate your computer without a battery; however, without a battery, the configuration information is erased if the computer is turned off or
unplugged from the electrical outlet. In this case, you must enter system setup (see

Removing the Battery

1. If you have not already done so, make a copy of your configuration information found in system setup (see
1. Follow the procedures in Before You
3 captive screw housing (2)
Replacing the Computer Cover.
Begin.
Entering System Setup) and reset the configuration options.
System
Entering System
Setup).