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Mine Exploration Forum

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Author Oldham charger prices
SRJ underwater mining

Joined: 31/01/2014

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Oldham charger prices
Posted: 15/09/2014 22:56:25
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I think my trusty Oldham Type 1 charger is starting to become a little less trusty and so im thinking about replacing it. Whats the going rate for a second hand replacement these days, a double or triple charger would be even better as it would save having to do one lamp at a time all the time.

cheers guys
IP: 92.2.103.248
Roy Morton

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Joined: 09/10/2007
Location: Redruth Cornwall

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Oldham charger prices
Posted: 15/09/2014 23:33:39
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You can successfully charge Oldhams from a PC power supply using the 5V rail.
As it's a constant voltage, the battery draws its own current as it needs it.
An average 300Watt supply will easily charge 8 to 10 lamps without grunting.

This is one I built some years ago which I still use. I’ll probably flog it when my Oldhams finally peg out.



(click image to open full size image in new window)


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NewStuff

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Joined: 26/07/2010
Location: NE Wales

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Oldham charger prices
Posted: 16/09/2014 07:14:22
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I've built one from a PC power supply too. Very easy to do, and almost any PSU will do if you are only charging a few. The PSU I used was a very cheap and nasty thing I wouldn't have trusted inside a PC, no issues at all, as I'm only pulling 30W from it at maximum (3 head charger).

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SimonRL

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Joined: 27/11/2005
Location: North Wales

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Oldham charger prices
Posted: 16/09/2014 08:16:44
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Pop up on eBay from time to time, I don't think they go much over £20.

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my orders are to sit here and watch the world go by
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royfellows

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Joined: 13/06/2007
Location: Great Wyrley near Walsall

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Oldham charger prices
Posted: 16/09/2014 09:28:06
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I wore an Oldham on saturday at Pumsaint, it was a blast from the past.
Actually, never switched it on
Had a dive lamp version of an X5000 in my hand with its fag packet size 12V 5.2 AH Lithium Ion battery in my pocket.
Imagine the comments!

Anyway I have a 5 bay electronic lead acid charger and a whole box full of good lead acid charger PCBs genuine Oldham/Clarke if can collect Cannock area.
Only talking what they call a "drink"

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As the chairman of six different caving clubs I cant find the time to go underground.
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SRJ underwater mining

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Oldham charger prices
Posted: 16/09/2014 10:29:58
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cheers guys, didn't know you could use a PC power supply, interesting to know and will be looked into further.

Roy i've sent a PM about the charger and PCBs
IP: 92.2.103.248
SimonRL

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Oldham charger prices
Posted: 16/09/2014 14:57:40
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royfellows wrote:

I wore an Oldham on saturday at Pumsaint, it was a blast from the past.


Were the guides using their new H2s?

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IP: 95.148.15.91
royfellows

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Location: Great Wyrley near Walsall

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Oldham charger prices
Posted: 16/09/2014 15:39:13
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SimonRL wrote:

royfellows wrote:

I wore an Oldham on saturday at Pumsaint, it was a blast from the past.


Were the guides using their new H2s?


There was only one guide and our own WMS guide, but I saw an H2 that was lent to one of our own people. Didn't take too much notice though, more interested in the mine.

--

As the chairman of six different caving clubs I cant find the time to go underground.
IP: 2.97.78.166
ChrisJC

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Joined: 13/10/2007
Location: Northants

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Oldham charger prices
Posted: 16/09/2014 18:11:21
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Charging from 5V? what sort of cells are they?, or is there a charging circuit built in? I know of no cell chemistries for which 5V is the perfect charging voltage.

Chris.
IP: 31.52.175.54
royfellows

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Oldham charger prices
Posted: 16/09/2014 18:25:10
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ChrisJC wrote:

Charging from 5V? what sort of cells are they?, or is there a charging circuit built in? I know of no cell chemistries for which 5V is the perfect charging voltage.

Chris.


Oldham lead acid batteries charge at 5V
The older chargers just use a resistor, I am told that the ammeter works as this, as the battery becomes charged the internal resistance rises and the current drops to a trickle.

At one time we would make our own chargers from a 6V car battery charger and some resistance wire from an old electric fire element. I know what you will think of this!

None of it good by modern standards.

More modern electronic chargers stop charging altogether when the battery is fully charged, same a modern car. Reason why modern cars never need batteries topping up.

Clarkes, the tool people, manufacturers of everything, made up the PCBs for genuine Oldham rack chargers. They may still do this, Simon will tell us I am sure.

--

As the chairman of six different caving clubs I cant find the time to go underground.
IP: 2.97.78.166 Edited: 16/09/2014 18:25:49 by royfellows
Lecko

Joined: 02/08/2008

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Oldham charger prices
Posted: 16/09/2014 19:18:13
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Last charger I built was with a 1 amp variable voltage regulator for a feller I worked with to charge his lamp he went fishing with, I set the output voltage for around 4.8 volts, "borrowed" the charging pin etc and an Oldham charge indicator, set it in a cheap aluminium case, and just charged him for the components.
Worked a treat for him.

Basic components from memory, 6-0-6 volt transformer, 1.5 amp bridge rectifier, couple of electrolytic caps, three terminal adjustable regulator and a variable pot for setting the regulator. I'd say the most expensive parts were the Oldham parts, but my employer bore the cost of those and the cap lamp I assembled for the feller I drew out of the stores. Got him a brand new headpiece/cable/battery cover, plus one brand new battery. Cheap at half the price...LOL
Innocent
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ChrisJC

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Oldham charger prices
Posted: 16/09/2014 20:59:30
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Presumably with charger 'technology' like this, you had to top up the electrolyte in an Oldham battery.

Chris.
IP: 31.52.175.54
Trewillan

Joined: 21/02/2012

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Oldham charger prices
Posted: 16/09/2014 21:07:40
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ChrisJC wrote:

Presumably with charger 'technology' like this, you had to top up the electrolyte in an Oldham battery.

Chris.


Yes, almost continuously.
IP: 146.90.248.67
royfellows

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Oldham charger prices
Posted: 16/09/2014 21:37:18
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But in the old days of Ts and the virtually indestructable but slightly heavier T2 you got away with it. Treat a T6 like that and it wont last 12 months.

And Chris, someone will correct me if I'm wrong, but I believe the charging voltage of 5V was recommended in the Oldham manual at one time?

--

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IP: 2.97.78.166
Lecko

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Oldham charger prices
Posted: 16/09/2014 21:46:22
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Roy, depends on altitude and climate. IP: 173.202.179.75
Lecko

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Oldham charger prices
Posted: 16/09/2014 21:56:42
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From Oldham's manual.

In situations overseas where very hot or very cold conditions are encountered, it may be advisable to use slightly lower or higher charging voltages for best results.
As an indication, whilst 4.9 volts is generally recommended for most overseas charging, this may with advantage be reduced to 4.8 volts if the general air temperature is consistently as high as 80 to 90 degrees F. (27-32C)
Similarly, in places where the general air temperatures is consistently 30-40F. (-2 to 4C), the voltage may with advantage be raised to 5.1 volts.

According to their manual, UK voltage charging should be around 5.1 volts.
IP: 173.202.179.75
owd git

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Oldham charger prices
Posted: 17/09/2014 07:57:36
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I have a double charger you are welcome to. where are you? o. g. IP: 2.102.13.219
royfellows

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Oldham charger prices
Posted: 17/09/2014 09:40:11
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Mr Lecko, thanks for this. Its now making sense.
Do you know anything about the construction of the T2 battery?

Holding one up to the light it appears to have 4 cells rather than 2, well sortish.

I know from personal experience they lasted for years, I think the most sturdy battery they produced. They also burned brighter, however they were made they seemed to have less volts drop under load.

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Lecko

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Oldham charger prices
Posted: 17/09/2014 11:58:55
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All models were two cells, can't recall how they made them up now, been almost 30 years since I worked with them, one thing I do recall, the SG was higher than a standard lead acid battery to give a longer "working" time.
Remember the whole lamp was made under license to the American company Koehler, same with the Ceags, which were almost identical.

I've not compared Koehlers and Oldhams new led cap lamps, but I'd hazard a guess they are very similar.
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owd git

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Oldham charger prices
Posted: 19/09/2014 15:53:19
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owd git wrote:

I have a double charger you are welcome to. where are you? o. g.

bump! no charge (pun intended)
IP: 2.102.13.219
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