Dell Precision 390 - Manual (Page 100)

2. Remove the computer cover (see Removing the Computer Cover ).
3. Locate the battery socket.
4. Support the battery connector by pressing down firmly on the positive side of the connector.
5. While supporting the battery connector, press the battery tab away from the positive side of the connector and pry the battery it up out of the securing
tabs at the negative side of the connector.
6. Properly dispose of the old battery. For more information, see your Product Information Guide.
Replacing the Battery
1. Follow the procedures in Before You Begin .
2. Remove the computer cover (see Removing the Computer Cover ).
3. Locate the battery socket.
4. Remove the existing battery. See Removing the Battery .
5. Support the battery connector by pressing down firmly on the positive side of the connector.
6. Hold the battery with the "+" facing up, and slide it under the securing tabs at the positive side of the connector.
7. Press the battery straight down into the connector until it snaps into place.
8. Replace the computer cover. See Replacing the Computer Cover .
9. Connect your computer and devices to electrical outlets, and turn them on.
10. Enter system setup (see Entering System Setup ) and restore the settings that you recorded when you removed the existing battery.
I/O Panel
NOTICE: If you pry the battery out of its socket with a blunt object, be careful not to touch the system board with the object. Ensure that the object is
inserted between the battery and the socket before you attempt to pry out the battery. Otherwise, you may damage the system board by prying off
the socket or by breaking circuit traces on the system board.
NOTICE: To avoid damage to the battery connector, you must firmly support the connector while removing the battery.
1 system battery 2 battery socket tab 3 battery socket
4 positive side of battery connector
NOTICE: To avoid damage to the battery connector, you must firmly support the connector while replacing the battery.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.