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Battery, Warranty, and
Service Information
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Batteries
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The HP-15C is powered by three batteries. In “typical” use, the HP-15C 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.
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A set of three fresh alkaline batteries will provide at least 60 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 135 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.
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If the calculator remains turned off, a set of fresh batteries will preserve the
contents of Continuous Memory for as long as the batteries would last outside of
the calculator—at least 1½ years for alkaline batteries or at least 2
years for silver-oxide batteries.
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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 you use.
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The batteries supplied with the calculator, as well as the batteries listed on the
next page for replacement, are not rechargeable.
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Power consumption in the HP-15C 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.
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