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Service and Maintenance
77
Battery Charging
The rechargeable
batteries
in
the
banery pack
are
charged whi le
you
operate
the
calcu
lator from the
ac adapter/recharger.
Batteries will
charge with the
calculator on or off,
provided
baneries are
in
place
and
recharger
is
connected.
Normal
charging
times between the fu
lly
di scharged
state
and the fu
ll
y
charged
state
are
(depending on
ac line
voltage):
Calculator
off:
5 to 9 hours
Calculator
on:
17 hours
Shorter
charging
periods wi
ll
reduce
the
operat ing
time
you can
expect
from
a
single
banery charge.
Whether the
calculator
is
off or on,
the
calcu
lator
battery pack
is
never
in
danger
of becoming overcharged.
Note:
The ac adapter/recharger is a sealed unit and is not
repairable.
Return it to Hewlett-Packard if
service
is required.
Battery Operation
To
ope rate
the
calculator
from battery power
alone
, simply
di sconnect
the recharger plug
from
the calc
ulator
by grasping
the
plug
between
thumb and forefin
ger, squeezing
to
depress
the snap
release
tab,
and
pulling
gently.
(Even
when
not connected to the
calc
ulator the
ac
adapter/recharger
may
be
left plugged into the
ac
out let.
)
Using
the
calculator
on
battery
power gives
the calculator fu
ll
porta-
bility, allowing you
to
carry
it
nearl
y
anywhere.
A full
y
charged battery
pack
typically provides 3 hours of continuous
operation.
By
turning the
power
off
when
the calc
ulator
is
not
in
use, the charge
on the battery
pack
should
easi
ly
last throughout
a
normal
working
day
.
Battery Pack Rep lacement
If it
becomes
necessa
ry to
replace
the battery pack, use
only
another
Hewlett -Packard battery
pack
like the
one
shipped
with
your
calculator.
CAUTION
Use
of
any batteries
other
than the Hewlett-Packard battery
pack may result in damage to
your
calculator
.
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