The Power Of Volts and Milliamps!!

Discussion in 'Medium Format Cameras and Accessories' started by ic-racer, Jul 17, 2013.

  1. ic-racer

    ic-racer Member

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  2. ic-racer

    ic-racer Member

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    Here is a battery that I last rebuilt quite a few years ago. It read 6V when I took the picture. I tried to restore it with some charge/discharge cycles on an automated charger without success. The pack with the yellow batteries measured 0V.
    file-113.jpg
     
    Last edited by a moderator: Jul 17, 2013
  3. ic-racer

    ic-racer Member

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    I put the new batteries in a box and used super glue to hold them together:
    file-114.jpg
    file-115.jpg
     
  4. ic-racer

    ic-racer Member

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    I made up solder tabs from brass sheet metal:
    file-116.jpg
    file-117.jpg
     
  5. ic-racer

    ic-racer Member

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    Solder the tabs in place:
    file-118.jpg
     
  6. ic-racer

    ic-racer Member

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    Solder on the end plate:
    file-119.jpg
     
  7. ic-racer

    ic-racer Member

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    Replace the padding and temp sensors:
    file-120.jpg
     
  8. ic-racer

    ic-racer Member

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    Put it all together:
    file-121.jpg
     
  9. ic-racer

    ic-racer Member

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    I just got back from shooting using the new battery. It really restored the camera to perfect function. The last few years, every time I picked up the camera the battery was dead. Charging only lasted for a day and even then the peak voltage was low.

    I'm working on an adapter plug so I can use an automated/computerized charger. The pins need to be exactly 1.5mm. I'm searching for suitable materials.
     
  10. polyglot

    polyglot Member

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    Hey, you know you can buy the cells with solder-tabs pre-installed (designed for making up packs!) instead of contact nubbins? That way you don't run the risk of thermal damage to the battery's chemistry when you solder the pack together.
     
  11. ic-racer

    ic-racer Member

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    I have always made my own tabs. I'm not sure pre-affixed tabs will line up correctly in a pack like this. Probably from habit, when I first rebuilt the pack in 1984, non-tabbed cells were all I could obtain.
     
  12. deisenlord

    deisenlord Member

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    The pre-built pack's work fine.
     
  13. deisenlord

    deisenlord Member

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    I also found one of the rare rollei power interface gizmos and its really great, I have a big NIMIH battery pack on a coil cord I plug into it. Go for days and days.
     
  14. gleaf

    gleaf Subscriber

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    Thin nickle strip bonded (pulse welded) for custom connections.
     
  15. ic-racer

    ic-racer Member

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    Here is my new charging setup:
    file-122.jpg
     
  16. ic-racer

    ic-racer Member

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    This is the custom connector I constructed to link the charger to the batteries. That other wire is the thermistor probe, the battery just sits on top of it when charging or I use a rubber band to hold it close to the battery:
    View attachment 71849
    View attachment 71850
    file-123.jpg
    file-124.jpg

    (double post? Some difficulty being encountered posting pictures lately; should be only two pictures posted)
     

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    Last edited by a moderator: Jul 19, 2013
  17. ic-racer

    ic-racer Member

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    Next is to make a charging adapter for the new SL3003 NiMH batteries.
     
  18. ic-racer

    ic-racer Member

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    Update: I'm traveling with the SLX and no charger. Day 5 and the battery is still going strong.
     
  19. andrewf

    andrewf Member

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    I'm really impressed! Good work!
     
  20. FiatluX

    FiatluX Member

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    Just did mine as well, altho with presoldered cells..
    Only to find that both my mags wont wind the film properly anymore, I´m guessing gummed up old lube or something similar after 12-15 years of no use. Sigh!
     
  21. E. von Hoegh

    E. von Hoegh Member

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    "The Power Of Volts and Milliamps!!"

    E x I = W
    Where:
    E= EMF in volts
    I = Current in Amps
    and
    W = Power in Watts
    :wink:
     
  22. ic-racer

    ic-racer Member

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    Someone got it!
    BTW I'm still basking in power...I have not had to charge for almost 2 months. Also, I discovered me 'broken' 33ft electric release works just fine now. A worn out battery won't provide trigger signal through the 33feet of cable.