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Hints, Tips and Solutions (Do NOT post requests for help here) If you have any useful general hints and tips for vintage technology repair and restoration, please share them here. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

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Old 7th Mar 2011, 7:17 pm   #1
michael cumming
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Default Recelling an AD28 battery.

Thought I would share this as I bought a batch of dud red colour Ever Ready AD28 batteries at the carboot on Sunday. I'm not sure how much these are new but some radios do use these in twos.

These are easy to take apart unlike the old type, they contain three large cells in series, each at 1.5V. To replace these simply take apart a 6V square shape lantern battery, these are cheap to buy at £1.99 each in some shops. Inside these are four of those large cells which are identical in size and voltage. Remove three of these and solder them in series and replace the cover of the battery, the new type AD28 only has one glued seam on the case.

Hope this is of use to someone as it's cheaper than buying new batteries.
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Old 22nd Mar 2012, 6:15 pm   #2
davyrocket2
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Smile Re: Recelling an AD28 battery.

Hi there, that's very useful to know as I have a couple of Bardic lamps that use them. Do you know if Duracell do these? I have a website if you private message me they are £7.99 each.
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Old 23rd Mar 2012, 1:51 am   #3
brunel
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Default Re: Recelling an AD28 battery.

Widely used in "Bardic" lamps

http://www.batterycompany.co.uk/shop...aline-battery/
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Old 23rd Mar 2012, 9:20 am   #4
Nickthedentist
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Default Re: Recelling an AD28 battery.

Very useful, Michael.

Nick.
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Old 10th Apr 2012, 10:16 am   #5
michael cumming
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Default Re: Recelling an AD28 battery.

I have a few Bardic lamps in my collection that use these. I have not seen this size from Duracell, just the red Eveready ones that you can get new. I have a Vidor one that's old, it's an L5043 and it's blue and yellow so these were used in some transistor radios in pairs to make 9V. I'm sure an Ultra model radio used these as did PAM radios.
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Old 15th Apr 2012, 12:10 pm   #6
GJR 11L
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Default Re: Recelling an AD28 battery.

What a brilliant, yet very simple idea. Duracell do indeed have one in their range, but it's better to be sitting down when you ask the price.
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Old 16th Apr 2012, 1:46 pm   #7
michael cumming
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Default Re: Recelling an AD28 battery.

I have just learned something as I did not know Duracell made these, are they in the black and gold colour cases? The ones I have seen on the internet are white.
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Old 21st Apr 2012, 11:50 pm   #8
GJR 11L
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Default Re: Recelling an AD28 battery.

Black and gold, yes. I have a pair in one of my continental portable FM sets of the early '60s where they occupy a holder that takes up exactly the same space as a PP9. Finding which one it is and where I put it, that's the tricky bit.
I'm sure that they came from the "specialist" applications range on the UK Duracell site but just looked there and could only find smaller batteries and individual cells in all the usual sizes. Tiredness.
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Old 25th Apr 2012, 3:14 pm   #9
Alvin
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Default Re: Recelling an AD28 battery.

Quote:
Originally Posted by michael cumming View Post
I'm sure an Ultra model radio used these as did PAM radios.
Pics show my recent car boot find a Perdio Caralux complete with two original batts which I may restuff following this excellent tip but for the moment the temporarily lashed in 6 x AA holder suffices.

You may be in for a surprise on opening up your lantern batteries http://s166.photobucket.com/albums/u...atteryhack.mp4 but probably not!!

Alvin
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Old 25th Apr 2012, 3:49 pm   #10
michael cumming
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Default Re: Recelling an AD28 battery.

They are an easy rebuild to do, inside you will find three large round cells wired in series. You can source replacement cells by taking apart a 6V lantern battery. Take care not to tear the battery case of your AD28s. I find a scalpel is best for the job, It does look like yours are in good condition so should come apart easily. I laminate the card cases but sometimes find you have to keep putting it through the lamonator as its card and not paper but it will be worth the effort. Your batteries are the last blue ones made, so date from early 1990's. The next lot after these were red with the logo. At least the battery plugs are there unlike some sets which have them removed. That's a lovely set there an if I see such sets with batteries, I buy with a view to restoring them using their original batteries.
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Old 26th Apr 2012, 1:15 pm   #11
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Default Re: Recelling an AD28 battery.

The alleged presence of numerous AA cells inside a 6 volt lantern battery is generally accepted to be a hoax or an urban myth.
I have disected numerous 6 volt lantern batteries, most contain 4 cells each F size, as others describe. Some cheaper ones contain 4 cells each D size and a spacer.

I do not see why a manufacturer would use 32 AA cells that would cost more than 4 D cells.
To obtain 6 volts from 32 cells would require relatively complex internal connections, with either numerous soldered connections, or some complex arrangement of spring clips etc, no such can be seen in the video, the cells simply slide out, loose with no evidence of any series connections.
Also the AA cells appear to lack any insulating plastic or card sleeves which would preclude series operation when they are touching, as appears to be the case.
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Old 26th Apr 2012, 2:04 pm   #12
michael cumming
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Default Re: Recelling an AD28 battery.

Broadgage you are spot on as it's a hoax but it can be done as I have tried it to see if it would work and it does but it's a lot of work and connections to make, if this battery was made this way the cost would be very high indeed. Four large cells in series is the way to go with these.

I cannot help but laugh at those who bought these things in the hope of finding all those AA cells, I bet sales increased and battery firms were clapping there hands. I hacked apart a 481 size Ever Ready battery to find twelve D size cells in four rows of three each row wired in series and the four joined in parallel to give 4½V. This was designed to last longer and was used in a large lamp I bought.

Here are the pics.
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Old 27th Apr 2012, 5:36 pm   #13
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Default Re: Recelling an AD28 battery.

Quote:
Originally Posted by GJR 11L View Post
Black and gold, yes. I have a pair in one of my continental portable FM sets of the early '60s where they occupy a holder that takes up exactly the same space as a PP9. Finding which one it is and where I put it, that's the tricky bit.
Hi John,

Sure they're not the MN1203, http://www.amazon.co.uk/Duracell-Plu.../dp/B00008JNWN ? I've a couple of AM/FM Nordmende Transita models here which each take a pair of those, and I've met the Duracell versions. The holders do indeed take up the same space as a PP9: a pair of AD28s in any configuration would be quite a bit larger.

Paul
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