Metz NiCD cluster for 45 CT/CL series flashes

Discussion in 'Lighting' started by bobfowler, Nov 30, 2005.

  1. bobfowler

    bobfowler Subscriber

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    Does anyone have any idea of how to disassemble one of these to replace the cells, short of breaking it? I have 3 packs for my 45 CT-1 whose cells are on their last legs, and the thought of replacing the 500 mAh cells with 1100 mAh is gnawing pretty hard!

    Before anyone suggests using NiMH cells in the Metz NiCD pack, it's important to consider that the charger for the pack is just a transformer with a 7V AC 600mA outlet and that the rectification and current limiting circuitry is in the pack itself. The same charger is used for the Dry-Fit pack with the 60 CT series flashes. Metz also warns that you shouldn't use NiCD or NiMH cells in the "standard" AA holder as the contacts aren't designed for and can't properly handle the extra current these cells can deliver.

    Any clues/insight would be greatly appreciated...
     
  2. Nick Zentena

    Nick Zentena Member

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    There is a website that covers replacing the batteries. Everything from cracking it open to replacing the batteries. It also covers the issues with switching to Nihm.

    Of course I can't find the #$C#$!@!#@ thing right now.
     
  3. Nick Zentena

    Nick Zentena Member

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  4. Nick Zentena

    Nick Zentena Member

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  5. Nick Zentena

    Nick Zentena Member

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  6. eumenius

    eumenius Member

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    That's a complete BS unless you're making three flashes per second - really, the plastic lamp housing would melt down sooner than the contacts in battery pack, in normal shooting mode. Their whine about too high a current through circuits is not relevant, too - in a normal mode, again.

     
  7. bobfowler

    bobfowler Subscriber

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    Nick, I owe you a beer! (or many beers!) :smile:

    This is just another example of why I love APUG!!!
     
  8. bobfowler

    bobfowler Subscriber

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    You're probably quite right. I wonder though, why the AA holder and the NiCD clusters use different ground pins INSIDE the flash handle. Perhaps something to prevent turning on the flash while the batteries are charging? I'd love to see a circuit diagram of this thing...
     
  9. 127

    127 Member

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    NiCd's put out a lower voltage than alkalines, and provide less current (greater internal resistance), so I assume the flash circuit is optimised internally to match the different battery types. I wouldn't put NiCD's into the AA's unless I switched the contact over to match. Worst case it could even throw out the metering (though I've no evidence of that).

    As for charging - the instructions specifically FORBID charging the pack while it's in the flash.

    I've dismantled and repaired a couple of packs - one had a broken connection, and fixed up fine. The other had a damaged charging circuit - it had somehow corroded, but I got it fixed no problem. Trouble is the cells needed replacing too, so while it charged, it still wasn't viable. Maybe one day I'll replace the cells.

    Anyway - they're pretty easy to work on even with my clumbsy skill. A bit small and fiddley, but not at all complex.

    Ian
     
  10. eumenius

    eumenius Member

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    The AA holder and NiCd clusters really us different ground pins inside, but the main difference is a small resistor in a NiCd circuit, with quite a negligible ohmic resistance... as I can understand, it's made just for cases when your 45 flash is used with old motorized Nikon F-3, say. Three frames per second, the current going from low inner resistance NiCds HAS to be limited by a resistor. If you shoot normally, there's no way to overheat the lamp and capacitor/inverter circuitry. The flashmeter is of course voltage-independent, if it were depending on cells voltage the normal operation of auto-aperture would have been impossible, as used cells give less voltage etc. - its circuit is more like an integrator of lighting time (close to shutter testers) than a, say, CdS regular resistance-based exposure meter. I use NiCds in my 45CT-1 with AA holders for ages, and the only problem I ever got this way was a bad synchro cord :smile:

     
  11. Nick Zentena

    Nick Zentena Member

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    I'll just send you my pack and you can redo at the same time-))
     
  12. bobfowler

    bobfowler Subscriber

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    FWIW, The NiCD Lady Company has Sanyo KR1100AAU AA 1100 mAh Flattops w/tabs for $3.00 each. They also have some good deals on NiMH and SLA as well.
     
  13. bobfowler

    bobfowler Subscriber

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    UPDATE

    I just recelled my first 45-40 pack... what a pain in the ass! Getting it apart was easy, getting the cells to line up correctly wasn't TOO bad, but getting it back together was a royal pain...

    one down, two to go...