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Thread: 2 aa vs 3 aaa

  1. #1

    Default 2 aa vs 3 aaa

    Which set up has the most available energy? ie if they are running the same emitter and control circuitry, which would last longer?

  2. #2
    Join Date
    Aug 2007

    Default Re: 2 aa vs 3 aaa

    2aa has about twice the available power as 3aaa

  3. #3
    Flashaholic* AnAppleSnail's Avatar
    Join Date
    Aug 2009
    South Hill, VA

    Default Re: 2 aa vs 3 aaa

    Your post is in LED. 3 AAA could direct-drive an emitter, so it would tail off towards zero output over infinite time. 2 AA requires a boost driver, which will have a particular efficiency and a minimum functional voltage.

    AAs usually have 2 Amp hours, while AAAs usually get about 800 mAh. A pair of AAs has 2 times voltage times capacity - for eneloops, 2*1.45v*2 Ah = 5.8 watt-hours. This is approximate, as the voltage will drop slightly towards the end of battery life. 3 eneloops AAAs would have 3 * 1.45v * .8 Ah = 3.48 watt-hours.

    You'll get more photon-hours at a reasonable level from 2 AAs, but 3 AAAs will still weakly light for a long time.
    My biggest light-hog is my camera.

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