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Thread: Best batteries for the maximum brightness

  1. #1

    Default Best batteries for the maximum brightness

    Given the space of a tube (a laser pointer) for 2xAAA batteries, what are the best batteries to power a Cree XR-E or Luxeon Rebel or SSC P4 LED, wanting the maximum brightness for 10 minutes?

  2. #2
    Flashaholic ak645's Avatar
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    Default Re: Best batteries for the maximum brightness

    Energizer lithium L92.

    Quote Originally Posted by mailint View Post
    Given the space of a tube (a laser pointer) for 2xAAA batteries, what are the best batteries to power a Cree XR-E or Luxeon Rebel or SSC P4 LED, wanting the maximum brightness for 10 minutes?

  3. #3
    *Flashaholic* Marduke's Avatar
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    Default Re: Best batteries for the maximum brightness

    Quote Originally Posted by ak645 View Post
    Energizer lithium L92.
    +1

  4. #4

    Default Re: Best batteries for the maximum brightness

    Quote Originally Posted by Marduke View Post
    +1
    This is what I thought too but then I thought that under the load of the LEDs the voltage of 2xAAA would go around a total 2.5V that would be too low.

    Look here what happens to a AA Energizer lithium battery under load:


    I think that I would better fill my 2xAAA-format laser tube with another combination of batteries, with an higher total voltage.

    Any suggestions?

  5. #5
    *Flashaholic* Marduke's Avatar
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    Default Re: Best batteries for the maximum brightness

    Detailed info here:
    http://data.energizer.com/PDFs/l92.pdf

    L91 is AA format

  6. #6
    Flashaholic ak645's Avatar
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    Default Re: Best batteries for the maximum brightness

    Let me see if I understand.You want to direct drive an LED at 1.4 amps on 2XAAA? In a tiny little pen light? Good Luck with that.

    Andy

  7. #7

    Default Re: Best batteries for the maximum brightness

    You will get extra pop from a Panasonic Oxyride. Brighter than the lithiums in my experience but without the smoother runtime curve.
    Orb Raw NS (UWOJ), VB-16 (Fourth Edition SSC), Fenix L1T 2.0 Rebel, MTE C2 70601, Liteflux LF2 (SSC P4), Fenix L0P-SE (SSC mod), Amilite Neo T5, Peak Caribbean (Seoul), Jetbeam CL-E 1.2, Fenix L2P (Nekomane CR2 mod), JIL CR2 1.3 (Up), Sam's Element, Streamlight ProPolymer Luxeon AA.

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    Flashaholic* LEDcandle's Avatar
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    Default Re: Best batteries for the maximum brightness

    There are only so many batteries available commercially.... and if you decide to go with li-on 10440, be careful that the capacity is only 300mah... its probably safer to stick within 1.5C.

    And what's up with starting so many threads practically talking about the same thing.....

  9. #9
    *Flashaholic* Marduke's Avatar
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    Default Re: Best batteries for the maximum brightness

    Quote Originally Posted by LEDcandle View Post

    And what's up with starting so many threads practically talking about the same thing.....
    Yeah, just noticed that too. mailint, you've asked the same question several times and gotten the same answer. You can't get 2A out of 2xAAA. Even 1A would be pushing it. The only way to get more power would be to use a capacitor setup, but that would release all the energy much, much faster (in seconds, or milliseconds). I would suggest lowering your standards in this instance.

  10. #10

    Default Re: Best batteries for the maximum brightness

    Quote Originally Posted by LEDcandle View Post
    There are only so many batteries available commercially.... and if you decide to go with li-on 10440, be careful that the capacity is only 300mah... its probably safer to stick within 1.5C.
    I also noticed that apparently low "300mah". Isn't it that it's calculated at a different load?

  11. #11
    *Flashaholic* mdocod's Avatar
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    Default Re: Best batteries for the maximum brightness

    a li-ion has about 3x the voltage and about 1/2(or less) the AH capacity of a similar sized NIMH cell. Overall energy density is usually higher with li-ion but in cell formats that small, li-ion isn't exactly on the bleeding edge...

    I think I would find the smallest 500+mA driverboard I could, run it on a pair of NIMH AAAs and call it a day.

  12. #12
    *Flashaholic* Marduke's Avatar
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    Default Re: Best batteries for the maximum brightness

    Just don't confuse lithium-ion with lithium primaries. They are different chemistries with different performance.

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