Have you ever wondered how much current a coin-cell scientific actually draws? Well, I did, so I cracked (not literally) my TI-36X Pro open and took some measurements with my trusty digital multimeter. My coin cell had a voltage of ~2.95V throughout the test.
Disclaimer: I cannot guarantee every TI-36X Pro ever manufactured would yield the same numbers during such a test. My serial# is L-1123F, so if yours looks similar then it's most likely going to be about the same.
Now, to the data!
* "MEMORY CLEARED" screen: 42μA
* Idle at homescreen after a mem clear: 30μA (spikes to 32μA during cursor blinks)
* MODE screen: 67μA (spikes to 70μA during selection blinks)
* MODE screen (second page): 50μA (spikes to 53μA during selection blinks)
* COMPLEX menu: 65μA
* MATH menu (MATH): 58μA
* MATH menu (NUM): 62μA
* MATH menu (DMS): 48μA
* MATH menu (R<->P): 61μA
* Data/List editor: 56μA
* Entering a series of integers into the data/list editor: 56μA - 119μA [fluctuates]
* FUNCTION TABLE menu: 61μA
* Exploring x^2 in the function table by spamming the down arrow key: 95μA - 168μA [fluctuates]
* Entering a MathPrint expression on home screen: 38μA - 109μA
* Calculating a numeric integral: 207μA (209μA when printing the answer just after calculation has finished)
* Summing a large series: 229μA
* Solving for 1 solution of a random quintic: 240μA
* "BREAK Error" screen: 46μA
As we can see, the calculator overall stays below ~60μA in its "idle" states and it's safe to assume it never goes above 300μA in its "heavy calculation" states. Cursor blinks add about 2-3μA due to LCD updates; the LCD is a moderately power-hungry component in general, it seems.
Assuming your CR2032 battery has a capacity of about 220mAh, you should get a solid 3,000 hours of use out of this calculator.
Disclaimer: I cannot guarantee every TI-36X Pro ever manufactured would yield the same numbers during such a test. My serial# is L-1123F, so if yours looks similar then it's most likely going to be about the same.
Now, to the data!
* "MEMORY CLEARED" screen: 42μA
* Idle at homescreen after a mem clear: 30μA (spikes to 32μA during cursor blinks)
* MODE screen: 67μA (spikes to 70μA during selection blinks)
* MODE screen (second page): 50μA (spikes to 53μA during selection blinks)
* COMPLEX menu: 65μA
* MATH menu (MATH): 58μA
* MATH menu (NUM): 62μA
* MATH menu (DMS): 48μA
* MATH menu (R<->P): 61μA
* Data/List editor: 56μA
* Entering a series of integers into the data/list editor: 56μA - 119μA [fluctuates]
* FUNCTION TABLE menu: 61μA
* Exploring x^2 in the function table by spamming the down arrow key: 95μA - 168μA [fluctuates]
* Entering a MathPrint expression on home screen: 38μA - 109μA
* Calculating a numeric integral: 207μA (209μA when printing the answer just after calculation has finished)
* Summing a large series: 229μA
* Solving for 1 solution of a random quintic: 240μA
* "BREAK Error" screen: 46μA
As we can see, the calculator overall stays below ~60μA in its "idle" states and it's safe to assume it never goes above 300μA in its "heavy calculation" states. Cursor blinks add about 2-3μA due to LCD updates; the LCD is a moderately power-hungry component in general, it seems.
Assuming your CR2032 battery has a capacity of about 220mAh, you should get a solid 3,000 hours of use out of this calculator.
