What is each button used for?

Wrong battery, I am researching
1 Lithium Metal batteries required. (included)
https://www.amazon.ca/Texas-Instruments-TI-30Xa-Scientific-Calculator/dp/B00000JBNS

Duracel 76a is a standard alkaline battery according to this

https://www.amazon.ca/Duracell-Specialty-Alkaline-Battery-long-lasting/dp/B007IAWVUM

But No, LR44 is the same as 76a. Did you change both?? You said 'I replaced THE battery', there is clearly two batteries.

https://www.ifixit.com/Guide/Texas+Instruments+TI-30Xa+Battery+Replacement/34616

Time for a new one probably.

Texas Instruments TI-30Xa Scientific Calculator ' www.staples.ca

www.staples.ca > ... > Calculators > Scientific Calculators

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[H+]=10^(-8.19). The - sign is the change sign key. The result is 1.2589x10^(-9)

You can find the entire guide for de TI-30XA following this link: http://education.ti.com/downloads/guidebooks/scientific/30xa/30xa-eng.pdf

On a TI-30XA the EE key is just above the 7 key.

On a TI-30XIIS the EE is the shifted function of the key just above the 7 key.

To enter powers of 10 as in scientific notations use the EE key.
To enter 13x10^6 type in 13 EE 6 =

For a manual here is the link

ec1.images-amazon.com/media/i3d/01/.../MANUAL000010660.pdf
manual above YES it IS a Scientific calculator indeed.

You can download the guidebook from the manufacturer's web site at
http://education.ti.com/educationportal/downloadcenter/SoftwareDetail.do?website=US&tabId=2&appId=6138

It's been a while since my TI calculator died, but I think you can just hit EE (may be "exp" on your model) followed by =.

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

You have to use the EE button right next to the parenthesis and the sigma plus button. So 1.7 EE and then your exponenet. If it is a negative exponent you need to hit the negative button before you type in the number.