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Old 5th Aug 2019, 1:22 pm   #1
IanF661
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Default Help Wanted On Battery Size

Hello.
I am currently working on a project to return to use a "Meter, Dose Rate, Portable, Trainer No1". The manual states that it requires 5 batteries, a D cell 1.5v (no problem there!) but also 4 batteries. The size stated for the commercial equivalents are: Ever Ready B105, Drydex DH105 and Siemens S105. Does anyone know of any available equivalent? Thanks in advance. Ian
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Old 5th Aug 2019, 1:34 pm   #2
Station X
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Default Re: Help Wanted On Battery Size

Hello and welcome to the forums.

B105 etc. is the correct description, but I've not heard of them before. They appear to be 30V batteries.

http://www.vmarsmanuals.co.uk/archiv...r_Handbook.pdf

I guess they'd be wired in series, so perhaps you could use an external 120V supply. Something like 12 PP3's in series.
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Last edited by Station X; 5th Aug 2019 at 3:53 pm. Reason: Sticking '1' key
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Old 5th Aug 2019, 3:27 pm   #3
terrykc
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Default Re: Help Wanted On Battery Size

12 PP3 alkaline batteries might do the trick but I can't find any details for the original battery regarding physical size, which could be useful.

Also, I wonder what the current demand is - the reason I specifically said alkaline PP3s, is in case it's on the high side.

Last edited by Station X; 5th Aug 2019 at 3:54 pm. Reason: Previous post edited.
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Old 5th Aug 2019, 3:35 pm   #4
mole42uk
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Default Re: Help Wanted On Battery Size

Is this the one?

https://www.megabatteries.com/item_d...d=599&uid=1926
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Old 5th Aug 2019, 3:55 pm   #5
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Default Re: Help Wanted On Battery Size

Dimensions are given, so it's a case of comparing them with the battery holder.
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Old 5th Aug 2019, 4:02 pm   #6
ThePillenwerfer
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Default Re: Help Wanted On Battery Size

A B105 was 1 5/16" x 1" x 2 13/16".

The suggested current range is 0.5 to 2mA.

Last edited by ThePillenwerfer; 5th Aug 2019 at 4:19 pm.
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Old 5th Aug 2019, 4:04 pm   #7
TonyDuell
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Default Re: Help Wanted On Battery Size

I've found a reference for the Ever Ready B105 (crosses to the Drydex DH505, which is not the number you listed so beware!) with dimensions given as 1+5/16" by 1" by 2+13/16". I think that's larger than a B123. It is listed as a 30V battery though.

(Posts crossed)
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Old 5th Aug 2019, 5:56 pm   #8
David G4EBT
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Default Re: Help Wanted On Battery Size

Looks like the simplest and most cost effective solution to fabricate a replica B105 30V battery of the required small dimensions would be a stack of either CR2032 or 2025 3V lithium 'coin cells'. They're both 20mm diam - the 2032 is 3.2mm thick and the 2025 is 2.5mm thick. The B105, being 1 5/16" long, equates to 33.85mm. A stack of ten 2032s would be 32mm, and hence, would just fit. A stack of ten 2025s would be 25mm so would leave a bit more scope to make terminations of one sort or another at each end of the stack.

There are thinner 3V coin cells - 2016 for example are only 1.6mm thick, but of course, the thinner the cell, the lower will be the capacity.

Cell Capacity:
2032: 230mA/Hr
2025: 170mA/Hr.
2016: 85mA/Hr.

The current requirement of 0.5 - 2mA is very undemanding so any of those would be well up to the task.

This link is useful for comparing cell sizes and current capacity. Not that the prices are per pack of five - not per cell:

https://www.esr.co.uk/electronics/batteries-lithium.htm

Hope that's of interest.
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Old 6th Aug 2019, 8:07 pm   #9
Brian of Romsey
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Default Re: Help Wanted On Battery Size

Quote:
Originally Posted by David G4EBT View Post

Cell Capacity:
2032: 230mA/Hr
2025: 170mA/Hr.
2016: 85mA/Hr.

The current requirement of 0.5 - 2mA is very undemanding so any of those would be well up to the task.

This link is useful for comparing cell sizes and current capacity. Not that the prices are per pack of five - not per cell:

https://www.esr.co.uk/electronics/batteries-lithium.htm

Hope that's of interest.
Just for clarity cell capacity is not in mA per hour, but rather in current multiplied by time. e.g. mAh. So in the cases above a CR2032 with a capacity of 230 mAh could supply the 2 mA the device might use for 160 hours, although that's a rough estimate. The CR2016 could do 40 plus hours.

So, indeed, coin cells are a good option for building a replacement 120 Volt battery.

Cheers, Brian.
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Old 8th Aug 2019, 4:12 pm   #10
duncanlowe
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Default Re: Help Wanted On Battery Size

Hi. I did the same for one of these for my nephew.

I used 1.5v round cells the same diameter as an AA cell. I used an AA holder and stacked them in. From memory I used a two rows of AA holder and chose battery heights that meant I got the right number of cells to give he required voltage. It worked OK. Sorry, no photos as I never expected to come across it again.
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