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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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5th Aug 2019, 1:22 pm | #1 |
Retired Dormant Member
Join Date: Aug 2019
Location: Swindon, Wiltshire, UK.
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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 |
5th Aug 2019, 1:34 pm | #2 |
Moderator
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Location: Ipswich, Suffolk, IP4, UK.
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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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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. Last edited by Station X; 5th Aug 2019 at 3:53 pm. Reason: Sticking '1' key |
5th Aug 2019, 3:27 pm | #3 |
Rest in Peace
Join Date: Nov 2010
Location: North Hykeham, Lincolnshire, UK.
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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. |
5th Aug 2019, 3:35 pm | #4 |
Nonode
Join Date: Aug 2010
Location: Resolven, Wales; and Bristol, England
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Re: Help Wanted On Battery Size
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5th Aug 2019, 3:55 pm | #5 |
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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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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
5th Aug 2019, 4:02 pm | #6 |
Octode
Join Date: Mar 2011
Location: Sheffield, South Yorkshire, UK.
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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. |
5th Aug 2019, 4:04 pm | #7 |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,208
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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) |
5th Aug 2019, 5:56 pm | #8 |
Dekatron
Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
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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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6th Aug 2019, 8:07 pm | #9 | |
Triode
Join Date: Jul 2017
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Re: Help Wanted On Battery Size
Quote:
So, indeed, coin cells are a good option for building a replacement 120 Volt battery. Cheers, Brian. |
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8th Aug 2019, 4:12 pm | #10 |
Nonode
Join Date: Jan 2016
Location: Stafford, Staffs. UK.
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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. |