Texas Instruments TI-73 EXPLORER - Manual (Page 346)

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Appendix C: Service and Warranty Information
99APPX-C.DOC Appx C:Battery/Service and Warranty Information, English Julie Hewlett Revised: 02/27/01 4:35
PM Printed: 02/28/01 11:29 AM Page 340 of 6
Battery Information
The TI N73 uses four AAA alkaline batteries and has a user-
replaceable backup lithium battery (CR1616 or CR1620).
When to Replace Batteries
When the battery voltage level drops below a usable level, the
TI
N73 displays the following message when you turn on the
unit.
Generally, the calculator continues to operate for one week
after the low-battery message is first displayed. After this
period, the TI
N73 will turn off automatically and the unit will
not operate. Batteries must be replaced. All memory is
retained.
Note : The operating period following the first low-battery
message could be longer if you use the calculator infrequently
or shorter if you use the calculator frequently.
Replace the lithium battery every three to four years.
The calculator does not let you install new software or
application programming if the batteries are too low.
Effects of Replacing the Batteries
Do not remove both types of batteries (AAA and lithium
auxiliary) at the same time. Do not allow the batteries to lose
power completely. If you follow these guidelines and the steps
for replacing batteries on the next page, then you can replace
either type of battery without losing any information in
memory.