Texas Instruments TITANIUM TI-89 - Manual (Page 148)

Operating the Calculator 148
When to Replace Batteries When to Replace Batteries When to Replace Batteries When to Replace Batteries
As the batteries get low, the display begins to dim (especially during calculations) and
you must increase the contrast. If you have to increase the contrast frequently, replace
the four alkaline batteries.
Note: The display may be very dark after you change batteries. Use 8 | to lighten the
display.
The status line along the bottom of the display also gives battery information.
The TI-89 Titanium Keyboard The TI-89 Titanium Keyboard The TI-89 Titanium Keyboard The TI-89 Titanium Keyboard
Most keys can perform two or more functions, depending on whether you first press a
modifier key.
Indicator in status line Description
Batteries are low.
Replace batteries as soon as possible.