Appendix D: Battery, Warranty, And Service Information; Batteries; Low Power Indication; Installing New Batteries - HP -11C Owner's Handbook Manual

Appendix D
Battery, Warranty, and
Service Information
Batteries
The HP-11C is powered by three batteries. In "typical" use, the
HP-11C has been designed to operate 6 months or more on a set of
alkaline batteries. The batteries supplied with the calculator are
alkaline, but silver-oxide batteries (which should last twice as long)
can also be used.
A set of three fresh alkaline batteries will provide at least 80 hours
of continuous program running (the most power-consuming kind of
calculator use*), A set of three fresh silver-oxide batteries will
provide at least 180 hours of continuous program running. If the
calculator is being used to perform operations other than running
programs, it uses much less power. When only the display is on—
that is, if you are not pressing keys or running programs—very
little power is consumed.
If the calculator remains turned off, a set of fresh batteriea will
preserve the contents of Continuous Memory for as long as the
batteries would last outside of the calculator—at least 1% years for
alkaline batteries or at least 2 years for silver-oxide batteries.
The actual lifetime of the batteries depends on how often you use
the calculator, whether you use it more for running programs or
more for manual calculations, and which functions vou use.*
WARNING
Do not attempt to recharge the batteries; do not store
batteries near a source of high heat; do not dispose of
batteries in fire. Doing so may cause the batteries to leak or
explode.
* Power consumption in the HP-11C depends on the mode of calculator use: off (with
Continuous Memory preserved); idle (with only the display on); or "operating" (running
a program, performing a calculation, or having a key pressed). While the calculator is
turned on, typical calculator use is a mixture of idle time and "operating" time.
Therefore, the actual lifetime of the batteries depends on how much time the calculator
spends in each of the three modes.
230
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Appendix D: Battery, Warranty, and Service 231
The batteries supplied with the calculator, as well as the batteries
listed below for replacement, are not rechargeable.
The following batteries are recommended for replacement in your
HP-11C:
Alkaline
Eveready A76*
Union Carbide (UCAR) A76
National or Panasonic LR44
Silver-Oxide
Eveready 357*
Union Carbide (UCAR) 357
Low-Power Indication
An asterisk (*) flashing in the lower-left corner of the display when
the calculator is on signifies that the available battery power is
nearly exhausted.
With alkaline batteries installed:
© The calculator can be used for at least 2 hours of continuous
program running after the asterisk first appears.*
If the calculator remains turned off, the contents of its
Continuous Memory will be preserved for at least 1 month
after the asterisk first appears.
With silver-oxide batteries installed:
¢ The calculator can be used for at least 15 minutes of
continuous program running after the asterisk first appears.t
e If the calculator remains turned off, the contents of its
Continuous Memory will be preserved for at least 1 week after
the asterisk first appears.
Installing New Batteries
The contents of the calculator's Continuous Memory are preserved
for a short time while the batteries are out of the calculator
(provided that you turn off the calculator before removing the
batteries), This allows you ample time to replace the batteries
* Not available in the United Kingdom or Republic of Ireland,
4 Note that this time is the minimum avaitahle for eantinuous program ruaning-—that ix, while cor
tinuously "aperaling" (ae described in the footnote an the preceedityy page). It you are the
caleulator for manual caleulations—a iniature of the idle and "operating" modes the catculator
can be used for a much longer time after the asterisk first appears