Battery Difference between CR2032 and CR2025

Discussion in 'Electronic Design' started by Sjouke Burry, Sep 3, 2012.

  1. Sjouke Burry

    Sjouke Burry Guest

    wrote in
    news::

    > My computer clock battery died. It had a CR2032. I bought a CR2025 at
    > a store going out of business (No Returns). Both say they are 3v. The
    > CR2025 is a little thinner, but otherwise they are the same size. Is
    > there any reason not to use the 2025?
    >
    > --------------
    >
    >


    To thin to fit in quite a few sockets.
    And if it fits a bit, it will be empty much sooner.
    Sjouke Burry, Sep 3, 2012
    #1
    1. Advertising

  2. Sjouke Burry

    Guest

    My computer clock battery died. It had a CR2032. I bought a CR2025 at
    a store going out of business (No Returns). Both say they are 3v. The
    CR2025 is a little thinner, but otherwise they are the same size. Is
    there any reason not to use the 2025?

    --------------
    , Sep 4, 2012
    #2
    1. Advertising

  3. Sjouke Burry

    Jamie Guest

    wrote:

    > My computer clock battery died. It had a CR2032. I bought a CR2025 at
    > a store going out of business (No Returns). Both say they are 3v. The
    > CR2025 is a little thinner, but otherwise they are the same size. Is
    > there any reason not to use the 2025?
    >
    > --------------
    >

    They are the same except that the 25 is lower amp rating. The
    25 at the end is 2.5mm verses the 3.2 mm you were using.. It'll
    work just fine but not last as long. Probably it'll last long enough
    for the rest of that computer's life.

    the 20 at the start is the width of the cell.

    I am doing this from memory but it should be correct.

    Jamie.
    Jamie, Sep 4, 2012
    #3
  4. Sjouke Burry

    Guest

    wrote:
    > My computer clock battery died. It had a CR2032. I bought a CR2025 at
    > a store going out of business (No Returns). Both say they are 3v. The
    > CR2025 is a little thinner, but otherwise they are the same size. Is
    > there any reason not to use the 2025?
    >
    > --------------
    >

    No.
    , Sep 4, 2012
    #4
  5. Sjouke Burry

    hamilton Guest

    On 9/3/2012 5:24 PM, wrote:
    > My computer clock battery died. It had a CR2032. I bought a CR2025 at
    > a store going out of business (No Returns). Both say they are 3v. The
    > CR2025 is a little thinner, but otherwise they are the same size. Is
    > there any reason not to use the 2025?
    >
    > --------------
    >

    Google knows:

    http://en.wikipedia.org/wiki/List_of_battery_sizes
    (2/3s down the page)

    ~2/3 the Capacity and smaller
    hamilton, Sep 4, 2012
    #5
  6. Sjouke Burry

    Jamie Guest

    Simon Stroud wrote:

    > "Jamie" <> wrote in message
    > news:VXb1s.1879$...
    >
    >> wrote:
    >>
    >>
    >>>My computer clock battery died. It had a CR2032. I bought a CR2025 at
    >>>a store going out of business (No Returns). Both say they are 3v. The
    >>>CR2025 is a little thinner, but otherwise they are the same size. Is
    >>>there any reason not to use the 2025?
    >>>
    >>>--------------
    >>>

    >>
    >>They are the same except that the 25 is lower amp rating. The
    >>25 at the end is 2.5mm verses the 3.2 mm you were using.. It'll
    >>work just fine but not last as long. Probably it'll last long enough
    >>for the rest of that computer's life.
    >>
    >> the 20 at the start is the width of the cell.
    >>
    >> I am doing this from memory but it should be correct.
    >>
    >>Jamie.
    >>

    >
    >
    > Yep that's correct.
    >
    > For a 2032, the 20 means the diameter (20mm) and the 32 means the thickness
    > (3.2mm). The 2025 is 2.5mm thick and the even thinner 2016 is 1.6mm thick.
    >
    > Most sockets are designed for a particular thickness so as others have
    > noted, the 2025 will not fit the socket correctly.
    >
    > Regards,
    > Simon.
    >
    >

    That is not totally true..

    Many sockets don't use the swing over spring arm, the cell is wedged in
    the socket via a side spring to hold it. This means it'll hold all the
    CR20xx sizes.. Your key FOB on most cars are a good example. At least
    the one on my jeep and Sante Fe are.

    Jamie
    Jamie, Sep 7, 2012
    #6
  7. Sjouke Burry

    Guest

    On Fri, 7 Sep 2012 00:30:29 +0100, "Simon Stroud"
    <> wrote:

    >
    >"Jamie" <> wrote in message
    >news:VXb1s.1879$...
    >> wrote:
    >>
    >>> My computer clock battery died. It had a CR2032. I bought a CR2025 at
    >>> a store going out of business (No Returns). Both say they are 3v. The
    >>> CR2025 is a little thinner, but otherwise they are the same size. Is
    >>> there any reason not to use the 2025?
    >>>
    >>> --------------
    >>>

    >> They are the same except that the 25 is lower amp rating. The
    >> 25 at the end is 2.5mm verses the 3.2 mm you were using.. It'll
    >> work just fine but not last as long. Probably it'll last long enough
    >> for the rest of that computer's life.
    >>
    >> the 20 at the start is the width of the cell.
    >>
    >> I am doing this from memory but it should be correct.
    >>
    >> Jamie.
    >>

    >
    >Yep that's correct.
    >
    >For a 2032, the 20 means the diameter (20mm) and the 32 means the thickness
    >(3.2mm). The 2025 is 2.5mm thick and the even thinner 2016 is 1.6mm thick.
    >
    >Most sockets are designed for a particular thickness so as others have
    >noted, the 2025 will not fit the socket correctly.
    >
    >Regards,
    >Simon.
    >


    It's contacting fine, and is working to keep my clock set. Teh contacts
    are on the side of the case part of the battery, so it seems to work
    just fine. This is an older IBM computer, and it needs a new battery
    every 8 months or so. It always has since I bought it around 2004.
    Seems that IBM computers all had (or still have) this problem. I'll
    live with it. At least they dont seem to have failing capacitors and
    the other failures that some other brands are known to have. Aside from
    eating batteries, these IBM systems seem to run forever.

    I should mention that I always shut off a power strip for the computer
    and all components hooked to it. I was told that leaving it plugged in
    and just shutting off the power switch would save batteries. But I'd
    probably pay for it in my electric bill, and possibly lose a computer
    from lightning. Lightning strikes are common on farms. I tend to lose
    a modem at least once a year and recently lost a DTV converter. I'd
    have to disconnect the antennas and phone lines and darn near everything
    else to prevent this. That gets to be a major hassle.
    , Sep 11, 2012
    #7
  8. Sjouke Burry

    spamtrap1888 Guest

    On Sep 10, 7:23 pm, wrote:
    > On Fri, 7 Sep 2012 00:30:29 +0100, "Simon Stroud"
    >
    >
    >
    >
    >
    >
    >
    >
    >
    > <> wrote:
    >
    > >"Jamie" <> wrote in message
    > >news:VXb1s.1879$...
    > >> wrote:

    >
    > >>> My computer clock battery died.  It had a CR2032.  I bought a CR2025 at
    > >>> a store going out of business (No Returns).  Both say they are 3v.  The
    > >>> CR2025 is a little thinner, but otherwise they are the same size.  Is
    > >>> there any reason not to use the 2025?

    >
    > >>> --------------

    >
    > >> They are the same except that the 25 is lower amp rating. The
    > >> 25 at the end is 2.5mm verses the 3.2 mm you were using.. It'll
    > >> work just fine but not last as long. Probably it'll last long enough
    > >> for the rest of that computer's life.

    >
    > >>  the 20 at the start is the width of the cell.

    >
    > >>  I am doing this from memory but it should be correct.

    >
    > >> Jamie.

    >
    > >Yep that's correct.

    >
    > >For a 2032, the 20 means the diameter (20mm) and the 32 means the thickness
    > >(3.2mm). The 2025 is 2.5mm thick and the even thinner 2016 is 1.6mm thick.

    >
    > >Most sockets are designed for a particular thickness so as others have
    > >noted, the 2025 will not fit the socket correctly.

    >
    > >Regards,
    > >Simon.

    >
    > It's contacting fine, and is working to keep my clock set.  Teh contacts
    > are on the side of the case part of the battery, so it seems to work
    > just fine.  This is an older IBM computer, and it needs a new battery
    > every 8 months or so.  It always has since I bought it around 2004.
    > Seems that IBM computers all had (or still have) this problem.  I'll
    > live with it.  At least they dont seem to have failing capacitors and
    > the other failures that some other brands are known to have.  Aside from
    > eating batteries, these IBM systems seem to run forever.
    >
    > I should mention that I always shut off a power strip for the computer
    > and all components hooked to it.  I was told that leaving it plugged in
    > and just shutting off the power switch would save batteries.


    Yes, you are discharging the battery every time you shut off the
    computer. But what's the problem? You just have to reset the time
    every time you boot.

    >  But I'd
    > probably pay for it in my electric bill, and possibly lose a computer
    > from lightning.  Lightning strikes are common on farms.  I tend to lose
    > a modem at least once a year and recently lost a DTV converter.  I'd
    > have to disconnect the antennas and phone lines and darn near everything
    > else to prevent this.  That gets to be a major hassle.


    Get a UPS that offers adequate surge protection.
    spamtrap1888, Sep 11, 2012
    #8
  9. Sjouke Burry

    Guest

    On Monday, September 10, 2012 10:23:27 PM UTC-4, (unknown) wrote:
    I was told that leaving it plugged in and just shutting off the power switch would save batteries.

    Battery life expectancy is determined by 'shelf life'. Typically five years. The battery will discharge just as quickly on a shelf or in that computer (assuming an IC that contains the CMOS was properly constructed).
    , Sep 11, 2012
    #9
  10. Sjouke Burry

    Guest

    On 11 Sep., 17:16, "Michael A. Terrell" <>
    wrote:
    > wrote:
    >
    > > On Monday, September 10, 2012 10:23:27 PM UTC-4, (unknown) wrote:
    > >  I was told that leaving it plugged in and just shutting off the power switch would save batteries.

    >
    > > Battery life expectancy is determined by 'shelf life'. Typically five years.  The battery will discharge just as quickly on a shelf or in that computer (assuming an IC that contains the CMOS was properly constructed).

    >
    >    Bullshit.  The computers RTC isn't static, it consumes some power at
    > all times.  When the computer isn't supplying the power, the battery
    > is.  It isn't much, but it will cut the battery life by half. The RTC
    > uses the same 32,768 hz crystal used in a digital watch, and the same
    > divider chain to generate the 1 PPS, followed by additional dividers to
    > track time & date.  it also has additional registers to store BIOS
    > settings.  No CMOS circuit is perfect.  All gates leak small amounts of
    > current, and the more a chip has, the more it consumes due to leakage.


    but it isn't much for something specially made for low current

    I just picked the first maxim rtc on their list
    http://datasheets.maximintegrated.com/en/ds/DS1339A.pdf
    something like 0.5uA

    looking at this: http://www.sony.net/Products/MicroBattery/cr/spec.html
    it doesn't seem to make much of a difference for a cr2025/cr2032


    -Lasse
    , Sep 11, 2012
    #10
  11. Sjouke Burry

    Guest

    On Tuesday, September 11, 2012 3:21:10 PM UTC-4, Lasse Langwadt Christensen wrote:
    .... it doesn't seem to make much of a difference for a cr2025/cr2032

    IC consumes so little current (nanoamps) that battery shelf life is the relevant parameter. Either battery should be good for at least five years as demonstrated by correct numbers (in nanoamps; not microamps).
    , Sep 12, 2012
    #11
    1. Advertising

Want to reply to this thread or ask your own question?

It takes just 2 minutes to sign up (and it's free!). Just click the sign up button to choose a username and then you can ask your own questions on the forum.
Similar Threads
  1. Barry Lennox

    Panel mounted CR2025 battery holder?

    Barry Lennox, Dec 2, 2003, in forum: Electronic Design
    Replies:
    0
    Views:
    426
    Barry Lennox
    Dec 2, 2003
  2. terry

    CR2032 can be charged?

    terry, Nov 1, 2004, in forum: Electronic Design
    Replies:
    5
    Views:
    4,250
    Guy Macon
    Nov 1, 2004
  3. Thaqalain

    DVD Remote Battery,leakages around CR2025

    Thaqalain, Aug 28, 2005, in forum: Electronic Repair
    Replies:
    4
    Views:
    358
  4. Joe G \(Home\)

    CR2032 battery leakage

    Joe G \(Home\), Jun 16, 2007, in forum: Electronic Design
    Replies:
    15
    Views:
    1,982
    David L. Jones
    Jun 18, 2007
  5. Vladimir

    Please explain the difference between battery manufacturers

    Vladimir, Nov 16, 2009, in forum: General Electronics Chat
    Replies:
    1
    Views:
    514
    Resqueline
    Nov 17, 2009
Loading...

Share This Page