9V Battery -6.5mA

Discussion in 'The Projects Forum' started by JDR04, Sep 23, 2013.

  1. JDR04

    Thread Starter Active Member

    May 5, 2011
    339
    4
    I was wondering if it is at all possible to work out just how long a 9V battery would last if connected to a circuit that is constantly drawing 6.5mA?

    Can this be calculated and how?

    Thanks Folks -JDR04
     
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,291
    1,255
    Depends on the battery and the current. If you look at the 100ma curve posted in this link yours will last longer with the low discharge current. So picking one in the middle the time would be greater than 350ma hours / 6.5 ma or around 53 hours.

    http://www.powerstream.com/9V-Alkaline-tests.htm
     
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  3. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    I think you skipped a decimal, it would be more like 100 hours. I thought 9V batteries were 500 mA/hr ballpark? That would be around 80 hour ballpark at 6.5 mA.
     
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