TI-30X MathPrint battery

[Matt Agajanian]

Hi. I’m looking at the Amazon description of the 30X and it notes that it takes a CR2 battery. So, I looked it up. It looks like a AA cylinder. So, I’m wondering if this is a thick calc, unlike the 36X, Casio 991EX, Sharp EL-W516X, etc. which have a thin thickness.
Or does the 30X take a CR-2032 or other thin battery?

[Steve Simpkin]

From the manual, the TI-30X Pro Mathprint model uses two CR2032 lithium coin batteries (see picture below). The TI-36X Pro uses only one CR2032 battery.
I suspect the reviews on Amazon that talk about an AA battery are for a different calculator model. In Amazon reviews for a given product I will often see reviews for completely different models or sometime entirely different types of products!

TI-30X Pro MathPrint Guidebook

   

[Matt Agajanian]

(11-14-2022 07:49 AM)Steve Simpkin Wrote:  From the manual, the TI-30X Pro Mathprint model uses two CR2032 lithium coin batteries (see picture below). The TI-36X Pro uses only one CR2032 battery.
I suspect the reviews on Amazon that talk about an AA battery are for a different calculator model. In Amazon reviews for a given product I will often see reviews for completely different models or sometime entirely different types of products!

TI-30X Pro MathPrint Guidebook

Yes. CR2/CR-2032, big difference.

By the way, are CR-2016s and CR-2032s interchangeable? I’m not saying mixing the two, 2016 in one battety slot and a 2032 in the other slot.

[Steve Simpkin]

(11-14-2022 10:10 PM)Matt Agajanian Wrote:  Yes. CR2/CR-2032, big difference.
By the way, are CR-2016s and CR-2032s interchangeable? I’m not saying mixing the two, 2016 in one battety slot and a 2032 in the other slot.

Lithium coin battery part numbers show their diameter in mm and thickness in 1/10th mm. Thus a CR2032 is 20 mm diameter and 3.2 mm thick. A CR2016 would be the same diameter (20 mm) but half as thick (1.6 mm). While a CR2016 would fit in the battery holder space of this calculator, I don't know how well the battery clip would touch the thinner battery. You would have to try it to find out.

https://digilent.com/blog/quick-coin-battery-guide/

[rprosperi]

(11-14-2022 10:10 PM)Matt Agajanian Wrote:  By the way, are CR-2016s and CR-2032s interchangeable? I’m not saying mixing the two, 2016 in one battety slot and a 2032 in the other slot.

They both have the same initial and operating voltage, but the capacity of the 2016 is much less. The 2016 is also much thinner, enough so that it may not meet all the contacts properly; it depends on how the battery 'socket' is made. Still, you should use the proper cells.

For these 'coin' cell batteries, typically labeled "CRXXYY"

XX is the diameter in mm
YY is the thickness in 10ths of mm

So, a CR-2032 is 20mm (2cm) wide and 3.2 mm thick.

So, you can see that the CR2016 is only half as thick as a CR2032

[Matt Agajanian]

(11-14-2022 10:28 PM)rprosperi Wrote:  

(11-14-2022 10:10 PM)Matt Agajanian Wrote:  By the way, are CR-2016s and CR-2032s interchangeable? I’m not saying mixing the two, 2016 in one battety slot and a 2032 in the other slot.

They both have the same initial and operating voltage, but the capacity of the 2016 is much less. The 2016 is also much thinner, enough so that it may not meet all the contacts properly; it depends on how the battery 'socket' is made. Still, you should use the proper cells.

For these 'coin' cell batteries, typically labeled "CRXXYY"

XX is the diameter in mm
YY is the thickness in 10ths of mm

So, a CR-2032 is 20mm (2cm) wide and 3.2 mm thick.

So, you can see that the CR2016 is only half as thick as a CR2032

Damn clever battery model number scheme. Thanks! 2032 it is, then.