Question about Texas Instruments TI-15 Explorer Calculator

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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!!

Posted by cdwilk24 on


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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


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

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SOURCE: Inputing scientific notation into my calculator


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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The last question first. To verify if Texas instruments will send you a new calculator in exchange for the old you have to contact them.
TI Contact Information
TI-Cares Customer Support Contact a TI-Cares Customer Support representative via e-mail or phone to order products, inquire about issues, or ask general questions about TI education technology.

1-800-TI-CARES (800-842-2737)
Monday - Thursday: 8 a.m. - 7 p.m. Central Time
Friday: 10 a.m. - 7 p.m. Central Time btn_download.gif Contact TI-Cares Support
TI-Cares Technical Support Our Technical Support Group is trained to answer your technical questions about TI calculators, software, and accessories.

972-917-8324 (This is not a toll-free number)
Monday - Thursday: 8 a.m. - 4:30 p.m. Central Time
Friday: 10 a.m. - 4:30 p.m. Central Time btn_download.gif Contact Technical Support
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