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I have got an old (produced in Malaysia in 80's or 90's) but still functional electronic calculator, Citizen SDC-848. It is said to be powered from two sources: solar panel and battery but in fact it works well only in properly illuminated places.
I'd like to know what kind of batteries are used in this type of calculator. In the Internet I can find only incomplete or contradictory information. Some sources claim that this calculator was powered only from the solar panel despite of the description on the cover: "2 POWER". Datasheet from an internet museum of calculators: http://mycalcdb.free.fr/main.php?l=0&id=6824 |
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06 Jun 2018, 11:04 |
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Open it up and post a picture of the battery(s).
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06 Jun 2018, 11:25 |
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I think it should use one or two 1.5V button cells. these batteries have wide range of dimensions - it is better to take original battery to the shop to buy similar one. the problem could be the cost of new battery may appear comparable to the price of the new such calculator.
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06 Jun 2018, 12:47 |
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Thanks for your replies revolution and shoorick.
I have opened it up for the first time and have taken the photo presented below: 
and yes, I am aware that the cost of the battery can be comparable with the cost of a new calculator.  |
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06 Jun 2018, 17:03 |
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MHajduk wrote: Thanks for your replies revolution and shoorick. The text written on the battery seems to give a lot of search results, even with Amazon pages. I wonder if this one is replaceable with the one used in desktops. |
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06 Jun 2018, 19:11 |
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I have made some searches too and found alternatives that are really cheap. However, to make the cost of delivery of the parcel lower than the cost of delivered items I have to combine it with sets of accumulators (for a digital camera etc.) that I'm going to order anyway.
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06 Jun 2018, 19:28 |
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It is difficult to know the scale but perhaps that is an LR44 size button cell.
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07 Jun 2018, 00:29 |
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revolution wrote: It is difficult to know the scale but perhaps that is an LR44 size button cell. The same sources also give the information that analogues for LR44 are G13 and A76. I'm not an expert in that matter and have got also another Citizen calculator SRP-45 (produced in Thailand in 90's) that needs two A76 batteries, so I most probably will buy two blisters containing pairs of LR54 and LR44 respectively. |
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07 Jun 2018, 09:07 |
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BTW: When the battery holder was soldered in, they forgot to clean up the flux residue (that is the brown stuff around the solder pads). The flux can be quite acidic. You might want to consider cleaning it off before it eats through the board. Products of the type "contact cleaners" usually are good for clearing that stuff away.
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07 Jun 2018, 09:13 |
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revolution wrote: BTW: When the battery holder was soldered in, they forgot to clean up the flux residue (that is the brown stuff around the solder pads). The flux can be quite acidic. You might want to consider cleaning it off before it eats through the board. Products of the type "contact cleaners" usually are good for clearing that stuff away. |
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07 Jun 2018, 09:22 |
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Yes. If you have some rubbing alcohol, or IPA, or similar, then you can try that also.
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07 Jun 2018, 09:38 |
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Here you have photos of the same battery with the scale added:
in centimeters 
in inches  |
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07 Jun 2018, 09:55 |
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11.6mm diameter is either LR44 or LR54. The LR44 is 5.4mm high. The LR54 is 3.1mm high.
You can also use SR instead of LR. |
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07 Jun 2018, 10:22 |
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revolution wrote: 11.6mm diameter is either LR44 or LR54. The LR44 is 5.4mm high. The LR54 is 3.1mm high. 
Detailed view:  |
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07 Jun 2018, 10:57 |
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I hope that vernier is not metal.
Yeah, it appears as though you have LR54 or SR54. |
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07 Jun 2018, 12:24 |
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So talking about shorting out those batteries with metallic verniers. Another thing to be careful of when you install the new one is to make sure you don't touch it with your fingers. The oils in the skin can create a bridge across the terminals and drain the battery within a few months. Wear some clean gloves, or use some plastic tweezers, or both, when handling the batteries.
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07 Jun 2018, 12:40 |
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revolution wrote: So talking about shorting out those batteries with metallic verniers. Another thing to be careful of when you install the new one is to make sure you don't touch it with your fingers. The oils in the skin can create a bridge across the terminals and drain the battery within a few months. Wear some clean gloves, or use some plastic tweezers, or both, when handling the batteries. |
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07 Jun 2018, 13:00 |
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You can get really cheap plastic vernier calipers. They aren't very accurate IME, but good enough for general usage if one isn't doing finely detailed work, and understands there are probably relatively big errors.
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07 Jun 2018, 13:13 |
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revolution wrote: You can get really cheap plastic vernier calipers. They aren't very accurate IME, but good enough for general usage if one isn't doing finely detailed work, and understands there are probably relatively big errors. |
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07 Jun 2018, 13:30 |
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using metal caliper you can measure battery insulated with thin polyethilen, obviously it may be piece of packing bag or similar
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08 Jun 2018, 05:41 |
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