Question about Texas Instruments TI-15 Explorer Calculator

# Calculator won't turn off with new battery installed.

I have about 10 Texas Instruments TI-15 that quit working over time. So I figured the battery went dead in them. Well I replaced the battery in some of them and now when I turn them on, they won't turn off. I have tried clearing the memory and everything. All of the other functions seem to work on them but just can't turn them off?? My wife uses these for teaching so any assistance would be appreciated!!

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### k24674

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• Texas Instru... Master

Hello,
If they are solar powered and if the power down button is not functionning I would not worry about them. Usually battery powered calculators have an automatic power down feature, and sometimes solar powered machines as well. The only free thing we get is the sun's energy. Maybe not the only one (oxygen).
Hope it helps.

Posted on Sep 07, 2009

## 5 Related Answers

### Anonymous

Press 0 STO 2 to clear your memory 2 (M2). to clear M1 and M3 press 0 STO 1 or 0 STO 3

Posted on May 27, 2008

### Anonymous

Posted on Oct 14, 2008

### Anonymous

it is just a (-) symbol and it is beside the decimal point (.) button

Posted on Mar 05, 2009

### Richard Klein

You can download all the manuals at this sites' troubleshooting section too. Plus you can get other great instructions and tips heree too.

Posted on Sep 05, 2009

### k24674

Hello,

1. To convert a number to scientific equation, use [2nd][Sci]
Exemples 12345 [=] screen shows 12345 Then [2nd][Sci] coverts it to 1.2345 ^04 to the power 4.
2. To enter directly a number in scientific notation (e.g. -1.2345 X10^(-65) a very small number) you use the [EE] key 1.2345[+ /-][EE][+/-]65 shows as -1.2345 -65
1.6X10^(-19) 1.6[EE][+/-]19 shows as 1.6 -19

Hope it helps

Posted on Sep 17, 2009

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