Replacing
the
CMOS
battery
If
the
CMOS
battery
fails,
the
date,
time,
and
configuration
information
(including
passwords)
are
lost.
An
error
message
is
displayed
when
you
turn
on
the
computer.
Important
Refer
to
“Safety
notices
(multi-lingual
translations)”
on
page
7
for
information
about
replacing
and
disposing
of
the
battery.
CAUTION:
When
replacing
the
lithium
battery,
use
only
Part
Number
33F8354
or
an
equivalent
type
battery
recommended
by
the
manufacturer.
This
procedure
describes
how
to
remove
and
replace
the
CMOS
battery.
1.
Remove
the
cover.
See
“Removing
the
cover”
on
page
85.
2.
Locate
the
battery.
See
the
system
board
illustration
for
your
machine
type
at
“Locating
parts
on
the
system
board”
on
page
87.
3.
You
might
have
to
remove
any
PCI
adapters
that
impede
access
to
the
battery.
4.
Remove
the
old
battery.
5.
Install
the
new
battery.
6.
Replace
any
PCI
adapters
that
were
removed.
Note:
When
the
computer
is
turned
on
for
the
first
time
after
battery
replacement,
an
error
message
might
be
displayed.
This
is
normal
after
replacing
the
battery.
7.
Go
to
“Completing
the
FRU
replacement”
on
page
120.
94
Hardware
Maintenance
Manual
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