Appendix C: Caring For And Using Your; Batteries; Low Power Indicator; Installing Batteries - HP -18C Owner's Manual

Caring for and Using Your
Calculator
Batteries
c
The HP-18C is powered by three alkaline batteries. A fresh set of bat-
teries typically will provide approximately six months to one year of
use. However, expected battery life depends on how the calculator is
used.
Use only fresh N-cell alkaline batteries. Do not use rechargeable
batteries.
Low Power Indicator
When the low battery annunciator (c::::J) comes on, the HP-18C can
continue operating for at least 40 hours. If the calculator is turned off,
Continuous Memory will be preserved for approximately one month.
Installing Batteries
If you have just purchased the HP -18C and are installing the batteries
for the first time, you can take as long as you'd like to complete these
procedures.
However, if you are replacing batteries, you should keep in mind that
there is a time limit for completing these procedures if you want to
preserve the information you have stored inside the calculator (Con-
tinuous Memory). Once the battery compartment is open, you must
replace the batteries and close the compartment within one minute to
prevent loss of Continuous Memory. Therefore, you should have the
new batteries readily at hand before opening the battery compart-
ment. Also, you must make sure the calculator is off during the entire
process of changing batteries.
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Caring for and Using Your Calculator 185