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CR2032 battery leakage

Discussion in 'Electronic Design' started by Joe G \(Home\), Jun 16, 2007.

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  1. Hi All,

    Does any one have any good data on this Lithium battey or web site where to
    get the data.

    of most interest is internal leakage current, shelf life, battery capacity

    Any pointers would be appreciated.

  2. I found some data sheets - but I would like to know the internal leakage
    current at ~ 25oC

  3. mpm

    mpm Guest

    Hi Joe.

    We use this exact same battery in our product.
    If you can't find what you're looking for, email me and I'll send you
    our research.

    Also, there is a (USA) transport regulation relating to shipping these
    batteries aboard commercial aircraft. Let me know if you need a link
    for that.

    FYI: There is also a BR3032, which uses a different chemistry and has
    a different load/life curve.

    If you're in a hurry, Dallas Semiconductor has several Application
    Notes on their site relating to coin cell battery lifetimes (when used
    with their real time clock products). I think you may find some of
    those quite helpful. Should be under the RTC
    section somewhere. -mpm
  4. Eeyore

    Eeyore Guest

    I found a data sheet for one using google.

    It was from

    3V, 235mAh, Max continuous discharge current 4mA, self-discharge <1% p.a.

  5. Gary Tait

    Gary Tait Guest

    There is? The only thing I heard of is that Lithium based cells of any sort
    cannot exceed the volume of a typical AA cell, to be carried on commercial
  6. John Larkin

    John Larkin Guest

    We use Panasonic BR2325 coin cells in several of our products, backing
    up the on-chip RAM in our CPUs, to store calibration tables and such.
    I got curious about lifetime so I had one of my test people pull
    batteries from return-for-repair units and test them for remaining
    capacity. We found no trend at all for battery capacity versus age
    over a 10-year span. In fact, the couple of batteries that had the
    most remaining mA-H were among the oldest.

  7. Thanks for your reply

    What does self discharge <1% pa mean?
    Does it mean less than 1% of 235mAh which is 2.35uAh leakage?

  8. Thanks for the hard-data. Joe

  9. I am trying to determine weather my electronics draws less current than the
    internal leakage.

    My electronics draws ~ 5uA and I wanted to compare this against CR2032

  10. Eeyore

    Eeyore Guest

    It means the cell loses less than 1% of its capacity in one year.

    You mean 2.53 mA (not uA and the hours don't come into a figure for current).

    No. It would be 1% / (365 * 24) to give it in Ah.

    I make that equivalent to a 268 pA leakage.

  11. Eeyore

    Eeyore Guest

    It may not be actual 'leakage'.

    In any event I calculated the loss of capacity to be equivalent to a 268pA
    leakage current.

    In practice, I believe that you may find losses from contamination caused by
    handling will exceed this figure.

  12. Thank Graham.

    See I got my scaling wrong.... many thanks once again.

  13. Umm.. you might want to double-check his calculations...

    Best regards,
    Spehro Pefhany
  14. redbelly

    redbelly Guest

  15. Eeyore

    Eeyore Guest

    Hmmm . Only out by a factor of 1000.

    268 nA.

    In practical terms it's academically small.

  16. Try here for starters:

    Temperature is the main factor in capacity loss with shelf life.

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