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Appendix C
Battery, Warranty, and Service
Information
Batteries
The HP-10C is powered by three batteries. In “typical” use, the HP-10C 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 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.
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.
*
The batteries supplied with the calculator, as well as the batteries listed below
for replacement, are not rechargeable.
*
Power consumption in the HP-10C 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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