Battery 173
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then
unplug it from the network wall jack.
3
Disconnect any telephone or telecommunication lines from the computer.
4 Disconnect your computer and all attached devices from electrical outlets, and then
press the power button to ground the system board.
5 If you have installed a padlock through the padlock ring on the back panel, remove the
padlock.
CAUTION: To guard against electrical shock, always unplug your computer from
the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an
unpainted metal surface, such as the metal at the back of the computer. While you work,
periodically touch an unpainted metal surface to dissipate any static electricity that could harm
internal components.
6
Open the computer cover.
7 Locate the battery socket. For the Dell Precision 450 computer, see "System Board
Components" or for the Dell Precision 650 computer, see "System Board Components"
or see the system board label inside your computer
..
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.
8
Remove the battery by carefully prying it out of its socket with your fingers or with a
blunt, nonconducting object such as a plastic screwdriver.
9 Insert the new battery into the socket with the side labeled "+" facing up, and snap the
battery into place.
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