Hi Roy , i had one of those conversions but couldn't get it to charge i got it in a box of goodies along with duel type chargers , but was unable to get it to hold charge , mine isn't filled with a bin liner buy White polystyrine LoL

Not one of mine, everything I build works
;D

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Just like to update you on my Oldham batteries and cap lamps
last September I actually sold some back to the Nottingham NUM retired miners association
They do a fantastic job going around primary schools teaching kids about the bye gone art of mining
they take shed loads of stuff and artifacts , dress the kids up in full kit and even set up a mock mine , so the kids can use the head sets in the dark
unfortunately their batteries were dying , I was at the big meet when I got talking to one of them , who just by chance wanted to know if anything I had with me was for sale
I said no , unless you want some Oldham cap lamps and a charger I had in my van
they were over the moon with them , so much so that I sold them some more a month later
It's really good to see the passion of these guys and the work they do in and around the schools of Nottingham
I'm glad that these lamps are helping with their project

http://www.nottscoalminingmemories.org.uk/page_id__62.aspx?path=0p11p 

Just to update this thread , For anyone who still uses Oldhams
I just found this on Google while searching for something else
it would appear that Enersys Hawker still make
Oldham lead acid lamps and batteries
this page was last updated on 25/02/15 sill showing them for sale

http://www.enersys-hawker.com/english/mining.asp?lang=e 

it would appear that Enersys Hawker still make
Oldham lead acid lamps and batteries

No they don't.
But what they do have is a large stock of existing components to dispose of, problem is that the the prices they quote are a bit imaginative.

They stopped manufacturing lead acid batteries a few years ago but continued to offer GT caplamps connected to L16 Li Ion batteries
They stopped GT caplamps about a year ago

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it would appear that Enersys Hawker still make
Oldham lead acid lamps and batteries

No they don't.
But what they do have is a large stock of existing components to dispose of, problem is that the the prices they quote are a bit imaginative.

They stopped manufacturing lead acid batteries a few years ago but continued to offer GT caplamps connected to L16 Li Ion batteries
They stopped GT caplamps about a year ago

Well maybe they should stop advertising their latest range in their adverts ?
"The Oldham GT series of Mining Lamps are the long established market leader in lead-acid technology based mining lamps. At the heart of the lamp is the totally reliable G headpiece with its prefocus halogen main bulb. This is combined with the T series of batteries, with the latest T5 and T6 models providing 16 Ah capacity. "
I bought 4 of those featured lamps complete with batteries and and 4 Yellow chargers (M656201)all brand new and all working (14 hours burn +)earlier this year, from a guy working in the ship building industry they are mint condition , shame there is no date on them ?

The T3 (dry charged) had a first fill date, apparently the colliery lamproom man would indent the segments when filled and issued.

[photo]101079[/photo]

The T3 (dry charged) had a first fill date, apparently the colliery lamproom man would indent the segments when filled and issued.

[photo]101079[/photo]

Hi thanks for that I wondered why they were not marked , my batteries were still boxed when I bought them so were never marked

I can see that you are keenly interested so just a bit of info I picked up. Obviously, if someone knows better feel free.

When Oldham developed the 'D' type LED headset they used an emitter (original Luxeon?) which was not very efficient but was capable of being focused into a very tight beam, as required in a working mine.
This LED outputs 90 lumens for a hit of 4 watts, same as a 4V X 1 amp bulb used in the GT headsets.

Therefore a battery capable of powering both for well over 12 hours was required, hence the L16. Lithium Ion, 16 ampere hours.

Obviously this kind of efficiency is a joke by modern standards but it was designed for a specific job.

I believe they have moved on from this and now produce something better which still meets the various standards.

Another point of interest is that to meet standards for working coal mines aluminium is right out of the equation, so you are stuck with plastic forever.
Again, I am told that the metal heatsink rim on the 'D2 type headset is cast nickel. Poor thermal conductivity but probably up to the job.

So come on, what can someone add to this?

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Roy, Oldhams stopped making lead acid battery's when the factory at crown point Denton closed a long time ago mate all battery's after that were crap.i used to get all my lamps from there, my mate was in-charge of the mining department ,15 bob for a new type R bargain oh the good old days had them all from H to T type, if only they had your heads on them now that would be a lamp .;D

Roy, Oldhams stopped making lead acid battery's when the factory at crown point Denton closed a long time ago mate all battery's after that were crap.i used to get all my lamps from there, my mate was in-charge of the mining department ,15 bob for a new type R bargain oh the good old days had them all from H to T type, if only they had your heads on them now that would be a lamp .;D

Does First National Battery of South Africa come into the later lead acid equation?

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Roy, Oldhams stopped making lead acid battery's when the factory at crown point Denton closed a long time ago mate all battery's after that were crap.i used to get all my lamps from there, my mate was in-charge of the mining department ,15 bob for a new type R bargain oh the good old days had them all from H to T type, if only they had your heads on them now that would be a lamp .;D

Does First National Battery of South Africa come into the later lead acid equation?

Didn't they make those vile MF cells.

Didn't they make those vile MF cells.

I believe so.

While I am here, a reality check.

I have just weighed an Oldham cable and got 165 grams, this is the later PVC rubbish, I believe the earlier rubber ones are heavier. I cannot see any reason why any other belt mount battery lamp should be different.
Guess what my bomb proof, cased and potted 2 cell helmet mount power pack weighs.
185 grams

An Oldham GT headset weighs 200 grams, my Dragon weighs 120 grams which possibly makes it the lightest lamp currently on sale.

Oldham bulb lamps outputs 50 lumens, Dragon D800 = 800 lumens, D1200 = 1175 lumens.

Walk mode on either is 200 lumens plus and burn time is well over 12 hours.

Price an outrageous £125

Sorry about bringing my lamps into the thread but I felt it more appropriate to compare than with someone else's
But my point is that miners lamps are designed to meet certification appropriate to working mines, for recreational use it not difficult really to do better.
Also given choice I would personally feel better going underground with a lamp made of aluminium than one made of plastic.

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