Using the extended life battery, Using, Extended – Lenovo THINKPAD X41 User Manual
Page 60: Life, Battery

5.
Align
the
front
of
a
fully
charged
spare
battery
with
the
front
side
of
the
battery
space
in
the
computer;
then
gently
push
the
battery
into
the
space.
6.
Slide
the
battery
lock
to
the
lock
position.
7.
Turn
the
computer
over
again.
Connect
the
ac
adapter
and
the
cables
to
the
computer.
Using
the
Extended
Life
Battery
You
can
attach
a
ThinkPad
X40
Series
Extended
Life
Battery
to
the
docking
connector
of
your
computer.
To
attach
an
Extended
Life
Battery
to
the
computer,
do
the
following:
1.
Check
the
state
of
the
main
battery.
If
it
is
not
attached,
or
if
it
is
attached
and
is
almost
discharged,
turn
off
your
computer,
or
enter
hibernation
mode.
If
the
main
battery
is
attached
and
has
enough
power,
enter
standby
mode.
2.
Disconnect
the
ac
adapter
and
all
cables
from
the
computer.
3.
Close
the
computer
display,
and
turn
the
computer
over.
Replacing
the
battery
36
ThinkPad
®
X41
Tablet
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and
Troubleshooting
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