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Thread: 4 AA vs. 1 D

  1. #1
    Flashaholic* Juggernaut's Avatar
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    Thinking 4 AA vs. 1 D

    I may be wrong here but from what I always hear is that you can normally only pull 1 amp from alkaline batteries. So why can you pull 4 amps out of 4 AA cells in parallel and only pull 1 amp out of a D cell? The D cell has more then 4 times the mass of the 4 AA cells, and they are made out of the same chemistry so why the differents?
    “What do you mean LEDs are more efficient then Incans?”, that’s just what they want you to think! It’s a Conspiracy, Man!

  2. #2

    Default Re: 4 AA vs. 1 D

    Silverfox has done 3Amp discharge tests with alkaline D cells.

    http://www.candlepowerforums.com/vb/...ad.php?t=64660

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    Flashaholic* swampgator's Avatar
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    Default Re: 4 AA vs. 1 D

    Quote Originally Posted by Juggernaut View Post
    So why can you pull 4 amps out of 4 AA cells in parallel and only pull 1 amp out of a D cell?
    Quick answer: 4 batts in parallel are drawing 1 amp each for a total of 4 amps. It's not a question relating to battery size or chemistry just the way the circuit is wired.

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    *Flashaholic* Mr Happy's Avatar
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    Default Re: 4 AA vs. 1 D

    A draw of 1 amp is really hard on an alkaline AA cell. Typical design loads are in the range of 0.5 to 0.75 amps for AA powered lights.

    An alkaline D cell can supply comfortably more, perhaps in the range of 2 to 3 amps on max for some high powered fluorescent lanterns. Though usually, D cell powered lights are designed for much longer battery life running in the 0.5 to 1 amp range.

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    Default Re: 4 AA vs. 1 D

    Quote Originally Posted by Mr Happy View Post
    An alkaline D cell can supply comfortably more, perhaps in the range of 2 to 3 amps on max for some high powered fluorescent lanterns.
    Not according to SilverFox's testing. Alkaline D cells suck at 3A discharge rates.

  6. #6
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    Default Re: 4 AA vs. 1 D

    Alkalines seem to suck at any discharge rate. Get over it

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    Default Re: 4 AA vs. 1 D

    Quote Originally Posted by Jarl View Post
    Alkalines seem to suck at any discharge rate. Get over it
    Heh, I think they're ok in super low draw devices like remote controls and calculators.

  8. #8
    Thread Killer Illum's Avatar
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    Smile Re: 4 AA vs. 1 D

    Quote Originally Posted by Jarl View Post
    Alkalines seem to suck at any discharge rate. Get over it
    from the reference of lithiums yeah...but compared to carbon-zinc they appear to be able to handle moderately high current with no problems. 1 amp from alkalines is possible, but not recommended as they tend to "burst" in your light. also runtime is a bit....

    both AA and D are single chambered cells...just Ds have more capacity, like something else
    1 D cell you have only one straw drinking out of a 2 liter can of coke
    4AA cells you have 4 straws the size of the one on your Ds but drinking out of 4 cups of coke, but unlike Ds theres not much "slurp" time until you hit bottom
    Last edited by Illum; 04-26-2008 at 12:51 PM.

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