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  1. #11

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    I don't care much for rechargables batteries myself, i stick with dry cell batteries.

    Jeff

  2. #12

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    Quote Originally Posted by E. von Hoegh View Post
    A battery consists of two or more voltaic cells, connected in series or parralel.
    Or used all by itself, which won't be series or parallel.

    Please note, the word is PARALLEL.
    Develop, stop, fix.... wait.... where's my film?

  3. #13
    Steve Smith's Avatar
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    Quote Originally Posted by tkamiya View Post
    Or used all by itself, which won't be series or parallel.
    One used by itself is a cell, not a battery!


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  4. #14
    Matthew Wagg's Avatar
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    Enerloops all the way. Those things are great. Had them out in the snow today in -5c and they worked perfectly.

  5. #15
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    Any idea how long these hold a charge "on the shelf " so to speak, as in charging two sets, one to use and the other set carried as backup
    WYSIWYG - At least that's my goal.

    Portfolio-http://apug.org/forums/portfolios.php?u=25518

  6. #16
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    Quote Originally Posted by bobwysiwyg View Post
    Any idea how long these hold a charge "on the shelf " so to speak, as in charging two sets, one to use and the other set carried as backup
    They're reported to have a charged shelf life of 3 years:

    http://us.sanyo.com/eneloop

  7. #17
    bobwysiwyg's Avatar
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    That should do.
    WYSIWYG - At least that's my goal.

    Portfolio-http://apug.org/forums/portfolios.php?u=25518

  8. #18
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    Quote Originally Posted by tkamiya View Post
    Are you planning to take 7.2 baterries and use a register in series to drop down the voltage whatever your flash calls for?

    I have a 45 something (I'm at work) and as I recall, it takes 6 batteries, which makes it 9 volts. It also has a different battery holder for rechargables.

    Please know that using registers for this purpose works very poorly. The voltage drop across the register will be current dependent, so when the flash is charging at full, the voltage will drop more and when it's fully charged, voltage drop will be zero - meaning full battery voltage will be applied to the flash unit.

    Also, whatever the voltage register drops will be dissipated as heat. It can heat up significantly.

    I think you mean resistors, not registers.

    Your right about the batteries. I forgot it took six AA. So three lithium ion batteries wold be 11.1v. Finding the right size is going to be tough.

    Resistors would have to be replaced so that the capacitors and strobes are protected. Increasing the resistance right behind the strobes (my flash has two) would decrease the voltage back down to a safe level.

    It's only a 2v increase so I'm not too worried about the capacitors.


    Here's a similar project. Someone made an external battery pack for their metz. 7.2v
    http://www.flickr.com/groups/strobis...57605526458924
    http://filmphotog.blogspot.com/ my blog

    Please visit my film photography youtube channel and subscribe:


  9. #19
    Steve Smith's Avatar
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    Personally, I wouldn't worry about it. I would happily run a flash expecting 9 volts on 11.1 volts. A resistor won't work to drop the voltage as the voltage drop across it will vary with current. If you set it so it drops 2 volts at the start of the charging cycle, when it is fully charged it will hardly drop any voltage.

    Three silicon diodes in series would do a better job dropping about 0.7 volts each.


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  10. #20

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    I've pretty much given up on using rechargeable AAs except in a digital P&S. I generally use the Costco (US Warehouse store) brand for AA and AAA. I avoid other off brand batteries in anything where the battery stays in the devise and can leak. Though I have had a number of Ray-o-vac batteries (left in a flashlight) leak.

    I do like the Pro-cells (made by Duracell). I used to get bunches of "used 1 time" Pro-cells free (they where used in recording and they would use a fresh battery in each session). I found that they had a very long shelf life and I never experienced any leaking.

    Of course, for all I know, all the batteries come out of the same factory in China.

    I've had a couple of small devises come with multiple generic alkaline button cells where 1 cell depletes much faster than the other cells (used concurrently) in that devise. I attribute that to inconsistent manufacturing quality; but I can't back that up with any actual testing.
    "Far more critical than what we know or do not know is what we do not want to know." - Eric Hoffer

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