Battery Information - Texas Instruments TI-89 Manual Book

Battery Information

When to Replace
the Batteries
Note: The uses four
TI-89
AAA size alkaline batteries.
The uses four AA
TI-92 Plus
size alkaline batteries.
Note: To avoid loss of
information stored in
memory, the
TI-89 / TI-92 Plus must be
off. Do not remove the
alkaline batteries and the
lithium battery at the same
time.
Effects of Replacing
the Batteries
Battery Precautions
576 Appendix C: Service and Warranty Information
The
TI-89 / TI-92 Plus
batteries, and a lithium battery as a backup for retaining
memory while you change the alkaline batteries.
As the alkaline batteries run down, the display will begin to dim
(especially during calculations). To compensate for this, you will
need to adjust the contrast to a higher setting. If you find it necessary
to increase the contrast setting frequently, you will need to replace
the alkaline batteries. To assist you, a
display in the status line area when the batteries have drained down
to the point when you should replace them soon. When the
indicator is displayed in reverse text (
alkaline batteries immediately.
To avoid loss of data, do not remove the lithium battery unless four
fresh alkaline batteries are installed. Replace the lithium backup
battery about every three or four years.
If you do not remove both types of batteries at the same time or
allow them to run down completely, you can change either type of
battery without losing anything in memory.
Take these precautions when replacing batteries:
¦
Do not leave batteries within the reach of children.
¦
Do not mix new and used batteries. Do not mix brands (or types
within brands) of batteries.
¦
Do not mix rechargeable and non-rechargeable batteries.
¦
Install batteries according to polarity (+ and - ) diagrams.
¦
Do not place non-rechargeable batteries in a battery recharger.
¦
Properly dispose of used batteries immediately.
¦
Do not incinerate or dismantle batteries.
uses two types of batteries: four alkaline
indicator (
BATT
), you must replace the
) will
BATT
BATT indicator