MP 1,1-5,1 BR2032 Status and failure symptoms

Discussion in 'Mac Pro' started by haralds, Jul 25, 2019.

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  1. haralds macrumors 6502a

    haralds

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    Jan 3, 2014
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    Silicon Valley, CA
    #1
    Is there any way to tell whether the BT2032 battery is ending its lifecycle?

    What are the failures caused by it?
     
  2. tsialex macrumors 603

    tsialex

    Joined:
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    Location:
    Brazil
    #2
    End of life point is depends on the application, generally below 2,7V. You should replace it around 2.9V, since it will rapidly decrease after that.

    In a MP4,1/5,1/6,1, battery basically just keeps the internal clock and the time from boot. When the battery fails, time from boot stops to increase or could have weird values stored, like negative values, this causes problems with macOS leading to KPs and can cause sleep to crash in a way that you will need to power off your Mac Pro.
     
  3. iluvmacs99 macrumors regular

    Joined:
    Apr 9, 2019
    #3
    Where is a good source in obtaining the BR2032? I find it difficult to source one as opposed to the CR2032 which is plentiful. Also can the CR2032 be used as a replacement for the BR2032?
     
  4. crjackson2134 macrumors 601

    crjackson2134

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    Charlotte, NC
    #4
  5. JoeInMilwaukee macrumors regular

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    Apr 7, 2015
    Location:
    Milwaukee, WI
    #5
    Both batteries are the same physical size and output the same voltage. My understanding is that the CR2032 is optimized for high-current, short-duration loads (for example, a garage door remote transmitter) whereas the BR2032 is optimized for low-current, long-duration loads (for example, memory backup).

    You can use a CR2032 in place of the BR2032 but it most likely won't last as long as the BR2032.

    When I replaced the BR2032 in my Mac mini, I went with a BR2032 from Digi-Key:

    https://www.digikey.com/products/en...000&quantity=&ColumnSort=0&page=1&pageSize=25
     
  6. verdejt macrumors 6502

    verdejt

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    Location:
    Central Florida
    #6
    besides taking the batter out and measuring it, is there any apps that can report the current state of the battery?
     
  7. haralds thread starter macrumors 6502a

    haralds

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    Jan 3, 2014
    Location:
    Silicon Valley, CA
    #7
    I just replaced mine. Probably was fine, but was 7+ years old. Have been struggling off and on with PCIE eSata enumeration issues, but this battery likely has no impact on that.
     
  8. tsialex macrumors 603

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #8
    Another difference between BR2032 and CR2032 is the chemistry tolerance for high temperatures of BR2032, BR2032 is rated for 80ºC wile most CR2032 are rated for only 60ºC.

    Panasonic BR2032:
    Screen Shot 2019-07-28 at 16.26.34.png

    Panasonic CR2032:
    Screen Shot 2019-07-28 at 16.29.09.png

    This is important for a Mac Pro or a Mac mini, since both are located in high temperature areas. A CR2032 in a Mac mini will fail in less than a year.
     
  9. haralds thread starter macrumors 6502a

    haralds

    Joined:
    Jan 3, 2014
    Location:
    Silicon Valley, CA
    #9
    Yup. Looked that up. The battery have a don't use after 2025, so plenty of time for now.
     

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8 July 25, 2019