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Anonymous Posted on May 30, 2007

Batteries drains quickly

My batteries will only last a couple of days if left in the calculator. It's like it is draining even though it had been turned off. I have to remove the batteries after I use it every time to keep it from draining. I'm using good/new Duracells

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  • Posted on May 31, 2007
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I had something similar, it kept saying "battery low" after putting in new batteries. Try the Clear method; Take out one battery, hold the Clear button, while holding it insert the battery again and press on, and release. Now press clear again, turn it off and turn it back on again. If that doesn't help... well it must be something else... sorry :S

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TI-84 Plus calculator keeps draining a set of batteries with each use. Can this be fixed?

Either you are putting in partially discharged batteries (test the new batteries with a battery tested NOT a voltmeter), or there is a partial short in the ca;culator (low impedance). If he batteries test good before insertion and they drain very quickly upon use, then the calculator is defective (it has some sort of low impedance in the circuitry. In this case, complain to Texas Instruments and have them give you a new calculator.
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My calculator drains a set of four batteries with every use. Why?

I am not sure what every use means: duration, programs running etc. But that drainage is properly excessive. TI estimates that with 2 hours a day of usage, the batteries should last a school semester.

Possible causes of rapid drainage.
The most common causes of rapid battery drain are mismatched batteries
  1. Batteries of different brands
  2. Batteries of different types (alkaline (1.5V + rechargeable NiMH 1.2V)
  3. Batteries of different charge levels (new batteries with old ones)
  4. Negative charge build up
Another cause of rapid battery drain is the use of third-party programs: Certain of them keep large amounts of data in memory. Some of them are tweaked to bypass the TI power management scheme and disable the TI APD (automatic Power Down ) after 5 minutes of inactivity.

Possible remedies
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  2. Leave them out of calculator for about 15 minutes. (Beware that this will clear the contents of the memory and that data will be lost along with all applications installed). However Applications cam always be reinstalled once calculator returns to its normal state.
  3. The possible benefit of the removal of all batteries is to make the negative charge build up disappear.
If that fails
If the foregoing steps fail to restore the calculator to its normal behavior, you may have to contact TI Customer Assistance by filling out and submitting a customer assistance form.




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I suggest you use rechargeable batteries. They usually drain faster than the alcaline ones anyway.So have 2 sets of rechargeable batteries. Evaluate the number of days a set lasts. Insert the charged batteries before the old ones are thourougly drained.

The life of your batteries in the calculator depends on the usage.

About repairs: I am convinced that it will cost you more to have it fixed than to buy a new HP calculator (HP 49g*'s, HP 50g* 's).

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