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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
    To thin to fit in quite a few sockets.
    And if it fits a bit, it will be empty much sooner.
     
  2. 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?

    --------------
     
  3. Jamie

    Jamie Guest

    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.
     
  4. Guest

    No.
     
  5. hamilton

    hamilton Guest

    Google knows:

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

    ~2/3 the Capacity and smaller
     
  6. Jamie

    Jamie Guest

    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
     
  7. Guest

    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.
     
  8. spamtrap1888

    spamtrap1888 Guest

    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.
    Get a UPS that offers adequate surge protection.
     
  9. 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).
     
  10. Guest

    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
     
  11. Guest

    . 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).
     
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