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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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9th Jun 2019, 1:07 pm | #1 | |
Banned
Join Date: Oct 2015
Location: Cornwall, UK.
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AD28 batteries no longer available? Substitutes?
Quote:
Not 'period' I know but it enables me to use this Perdio radio without fuss. Regards Poppydog Last edited by Station X; 11th Jun 2019 at 1:36 pm. Reason: Thread split. |
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9th Jun 2019, 1:07 pm | #2 |
Dekatron
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,339
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Re: AD28 batteries no longer available? Substitutes?
Amazon seem to have the Duracell version available from several suppliers. The last Duracell one I had came in a two -part interfitting plastic housing that could be prised apart, revealing a space big enough , after removing some struts, to take a three or four- AA cell battery holder. I was going to do that when the Panasonic battery in our kitchen torch dies, but despite being several years past its best by date, it is still soldiering on.
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9th Jun 2019, 2:08 pm | #3 |
Pentode
Join Date: Oct 2018
Location: Coventry, West Midlands, UK.
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Re: AD28 batteries no longer available? Substitutes?
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9th Jun 2019, 3:24 pm | #4 |
Dekatron
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
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Re: AD28 batteries no longer available? Substitutes?
Weird. My earlier search ("LR25 battery") was on my smartphone. Doing the same search (with no maker specified) on my laptop only brought up Eveready items. Searching "Duracell LR25" brought up similar, but not identical, results to the one I had got using my smartphone. Screenshot attached.
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9th Jun 2019, 3:43 pm | #5 |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
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Re: AD28 batteries no longer available? Substitutes?
Another search that may be worth trying is 'bardic lamp battery'. Without wanting to go way off-topic, the Bardic lamp is a handheld signalling lamp that was used on railways and is still used by preserved railways and railway collectors. Said lamp uses an AD28 battery
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9th Jun 2019, 3:58 pm | #6 |
Octode
Join Date: Mar 2011
Location: Sheffield, South Yorkshire, UK.
Posts: 1,453
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Re: AD28 batteries no longer available? Substitutes?
I've had a look 'round out of curiosity with the same result as Paul. There may be hope as the suppliers are showing them as "out of stock" rather than "No longer available," "Obsolete" or some-such.
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9th Jun 2019, 4:19 pm | #7 |
Octode
Join Date: Jul 2009
Location: Cheshire, UK.
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Re: AD28 batteries no longer available? Substitutes?
I've asked my brother who volunteers at Crewe Heritage Centre, but I suspect I will get the same answer that the AD28/3R25 battery is no longer available.
The Bardic lamps are not just used for railways, there are GPO, MOD, RS and probably other versions. I suspect Unipart-Rail will probably have the batteries, but I can't imagine they would be reasonably priced from them and of course they sell modern LED signal lamps, which will have probably reduced demand for the AD28 bettery. I wonder if the Duraleak one is actually the smaller 3R12 battery. David Last edited by factory; 9th Jun 2019 at 4:33 pm. |
9th Jun 2019, 5:15 pm | #8 |
Dekatron
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
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Re: AD28 batteries no longer available? Substitutes?
Large customers can probably have them made to special order. Some years ago I posted some extracts from a 1980's Vidor Professional battery catalogue showing that many HT batteries, such as the 120V "Winner", continued to be available as stock items for some years after they had ceased to be available in the shops, and that other obsolete types could be supplied to special order.
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9th Jun 2019, 8:09 pm | #9 | |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
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Re: AD28 batteries no longer available? Substitutes?
Quote:
Add some kind of fuse though as the short circuit current of rechargeable cells is high enough to start a fire without much difficulty. N. |
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9th Jun 2019, 8:15 pm | #10 |
Nonode
Join Date: Jan 2010
Location: North Somerset, UK.
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Re: AD28 batteries no longer available? Substitutes?
I would be very surprised indeed if production of AD28s has ceased.
There is still significant demand from HM forces and from the rail industry. I consider it more likely that these batteries are produced not continually, but in batches of a few hundred or a few thousand, with gaps in production during which some other battery is made. This time, for some unknown reason, existing supplies have been largely depleted before manufacture of the next batch starts. I am not aware of any alkaline equivalent. |
9th Jun 2019, 10:13 pm | #11 | |
Pentode
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Re: AD28 batteries no longer available? Substitutes?
Quote:
http://www.whiteknight.uk.com/rail-industry.html |
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9th Jun 2019, 10:15 pm | #12 |
Nonode
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
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Re: AD28 batteries no longer available? Substitutes?
Poppydog, You seem to have a range of different AA cells in your holders. Not a good idea! too many leaking cells when correctly used, but mixing them up as you are doing is a recipe for more leakages.
Les. |
9th Jun 2019, 10:42 pm | #13 |
Nonode
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
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Re: AD28 batteries no longer available? Substitutes?
I restuffed the AD28 battery for my railway lantern using cells from a 996 lantern battery, the cells are exactly the same size.
Peter |
10th Jun 2019, 12:16 am | #14 |
Hexode
Join Date: Oct 2007
Location: Ossett, West Yorkshire, UK.
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Re: AD28 batteries no longer available? Substitutes?
A few months ago I noticed a number of sellers on eBay asking £20 plus for Eveready AD28s. Previously I had bought a pair for around £8 including postage! I think they've gone!
David |
10th Jun 2019, 12:24 am | #15 |
Nonode
Join Date: Jan 2010
Location: North Somerset, UK.
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Re: AD28 batteries no longer available? Substitutes?
There are indeed a number of alternatives to the Bardic handlamp for railway use, nevertheless the older lamps remain popular and are widely used.
HM forces also use these lamps for signaling purposes when radio silence is needed, or as a standby facility. |
10th Jun 2019, 10:51 pm | #16 |
Dekatron
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Location: Bewdley, Worcestershire, UK.
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Re: AD28 batteries no longer available? Substitutes?
I have an elderly Ultra Transistor 101 which takes a pair of AD28s, and when I acquired the set several years ago and restored it I was a bit surprised that AD28s were cheap and readily-available then.
I suspect there is one single source (in the USA?) which turns these out in batches, as has been suggested. I’ve quickly found half a dozen retailers on line, all showing out of stock. Anyway, thanks for the warning! I’ll look after my batteries, as they will need re-stuffing in the future, although to be honest I’ll probably fit three D cells in a holder rather than F cells.
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Phil Optimist [n]: One who is not in possession of the full facts |
10th Jun 2019, 11:07 pm | #17 |
Dekatron
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
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Re: AD28 batteries no longer available? Substitutes?
As stockists are showing "out of stock" rather than "discontinued", they might just be awaiting delivery. A couple of years ago, the traction quality AGM sealed lead acid batteries for my electric bike were out of stock at Farnell, and on enquiring, delivery was not due for some three months. They did arrive eventually.
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10th Jun 2019, 11:09 pm | #18 |
Pentode
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Re: AD28 batteries no longer available? Substitutes?
With the lantern you get four cells and the AD28 only needs two I do this as I have two bardic lamps one a silver one railway type and a yellow apparently issued to London transport
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11th Jun 2019, 8:34 am | #19 |
Pentode
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Re: AD28 batteries no longer available? Substitutes?
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11th Jun 2019, 9:41 am | #20 |
Octode
Join Date: Nov 2011
Location: Manchester, UK.
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Re: AD28 batteries no longer available? Substitutes?
I wonder if laptop cells, 18650, about 4v, would be close enough. 3 in parallel would last a good while and the size looks about right - and they're free in a dead laptop battery near you
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