Completely off-brand, but interesting results

[DA74254]

Hello,
A couple of years ago, at a "school-start discount", I bought this calculator for €4 at the local supermarket in Riga, Latvia. Mostly because it was cheap, and it resembled my Casio FX-82 from my 9th year at primary school, back in 1983. The label states "1,5V AG13" battery, which I had to look up. It's LR44.
As the pictures shows, it has a "battery compartment", but you still have to dismount all 6 screws to open the back. Pictured, there are 2 pc LR44 (or "AG13"), so assuming they are in parallel.
Pictures showing the calculator in "off" state with the lid/cover including basic instructions, poorly placed as a paper sticker inside the cover. Though, see the pictue of the "calculator forensics" of the sin(cos(tan(atan(acos(asin(9)))))). It shows 8,999999998. That was a suprise for the very cheap and very Chinese clone. Even the Chinese Kinpo HP35s has less significant digits accuracy..
   
   
   
   

[Maximilian Hohmann]

Hello!

(10-09-2024 06:22 PM)DA74254 Wrote:  The label states "1,5V AG13" battery, which I had to look up. It's LR44.

The "AG" designations come from the Japanese Industrial Standard (JIS) and mean the same as "LR": Alkaline-Manganese. Why I don't know because neither "AG" nor "LR" have any manganese in them...
As a collector of watches, mainly from "Swatch", I always keep a plentiful supply of "AG" batteries from AG2 to AG10... And AG13 for some calculators.

Regards
Max

[RPNerd]

(10-09-2024 06:22 PM)DA74254 Wrote:  Pictured, there are 2 pc LR44 (or "AG13"), so assuming they are in parallel.

I think they're in series. I reckon the negative terminal of the left battery connects to the positive terminal of the right battery and the wires carry 3VDC to the PCB.

[HP67]

That looks like a Sharp clone.

[DA74254]

(10-10-2024 08:09 AM)HP67 Wrote:  That looks like a Sharp clone.

Apart for the 2-line display, it is pretty much like this one, which I still have (well, my sister apprehended it, but it is still "in the family").
http://www.arithmomuseum.com/album.php?c...49&lang=en

[Dave Britten]

This appears to be a nearly exact copy of the fx-270W Plus or fx-83WA.

https://casio.ledudu.com/pockets.asp?type=1192&lg=eng

https://casio.ledudu.com/pockets.asp?type=1020&lg=eng

[HP67]

<FACEPALM> I mean Casio and I wrote Sharp.

I had 2 Casios similar to the OP's pics, one was solar.

Thanks for the corrections, guys!