Need to find 3V watch batteries to light 10mA LED

Discussion in 'General Electronics Chat' started by athulascc, Mar 11, 2015.

  1. athulascc

    Thread Starter Member

    Aug 15, 2014
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  2. DickCappels

    Moderator

    Aug 21, 2008
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  3. Roderick Young

    Member

    Feb 22, 2015
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    Type 2032 batteries have no intentional current limiting on them, as do many of the smaller coin-type lithium batteries. It's common to see two of them in series used to power a stubby LED flashlight (torch).
     
  4. athulascc

    Thread Starter Member

    Aug 15, 2014
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    can i find 3v this type battery. this one is 1.2v
     
  5. wayneh

    Expert

    Sep 9, 2010
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    The CR2032 is a 3V lithium.
     
  6. athulascc

    Thread Starter Member

    Aug 15, 2014
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    yes but 2032 can not give 10mA. it has designed for low current such as 1mA.
    above suggestion of nicd cells is very good. i am try to find 3v battery very thin and need to deliver 10mA about 15hrs
     
  7. Dodgydave

    Distinguished Member

    Jun 22, 2012
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  8. Roderick Young

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    Feb 22, 2015
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    If you put two CR2032 in series, I think you'll be pleasantly surprised at the amount of current you can get, and the battery life. Smaller cells like the 2025 or 2016 have a maximum current drain specified, but not the 2032 (although it is, of course, limited by internal resistance).

    I'm not saying that you can necessarily get your 15 hours, but if you can't, then just use more batteries in parallel. You'll still have the 2mm thickness if you build out instead of stacking the cells up.

    2xCR2032 is used in these little flashlights that I have, and the life is quite good.

    CR2032inside.jpg stubby.jpg
     
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