Solution 11877: Battery Voltage Required to Power a TI Graphing Calculator.
What is the battery voltage required to power a TI graphing calculator?Typically, a graphing calculator requires approximately 6 volts to run, the equivalent of four AAA batteries. When the battery power decreases through use, the contrast on the calculator's screen may need to be adjusted to compensate for the loss of power. In most cases, the batteries will need to be changed when the reduction in voltage reaches about 4.0 to 4.2 volts.
The above figures vary a bit from model to model. In addition, the need to change the batteries is affected by electrical component variations in the unit, as well as user preferences and viewing angle.