Any correlation between 4S battery and build week?

Discussion in 'iPhone' started by f00f, Oct 17, 2011.

  1. f00f, Oct 17, 2011
    Last edited: Oct 17, 2011

    f00f macrumors 65816

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    #1
    EDIT: As it turns out the quoted interpretation of serial numbers (below) is likely incorrect. Instead, to determine your build week please try this tool (thanks HiRez) to determine build week. The tool was made for older iphones but it may still be valid for IP4S?

    EDIT: If you are having battery issues please try Airplane Mode and putting your phone to sleep and observing the battery drainage. If it's significantly less drainage this is all very very likely just an iOS problem!

     
  2. myfirst512 macrumors newbie

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    Jul 24, 2011
    #2
    Honestly, I'm a little disappointed with my battery as well... it seems to be draining VERY quickly. Mine is C39.
     
  3. snapper2323 macrumors member

    snapper2323

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    May 8, 2009
    #3
    Mine is c38 as well and my battery is not very good. My iphone 4 battery lasts much longer.
     
  4. f00f thread starter macrumors 65816

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    #4
    My wife's 64GB white IP4S is C39 as well.

    Hers has dropped 24% in just under 5 hours of standby, 28 minutes usage.

    edit: OK we just need to hear from folks that have good batteries :)
     
  5. HiRez macrumors 603

    HiRez

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    #5
    Interesting theory, don't know if it pans out though. I have 2 new iPhone 4Ss, each of them is "C39" and both are getting very good battery life so far (whether idle or in use), and both have pretty much everything turned on (location, Bluetooth, push email, etc.). Seeing 5.5 to over 9 hours of active usage time (3D games run it down faster), and when idle they only drop about 3% overnight (8 hours), but still everything turned on. Verizon phones, screen brightness at about 50%.

    What might be even more relevant than the build week is the location where they were built, maybe a certain batch from a certain production line is bad. Don't know if there's a way to determine that.
     
  6. Ferrd macrumors regular

    Ferrd

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    #6
    Umm, my Serial # begins with DNP. What the heck does that mean?
     
  7. f00f thread starter macrumors 65816

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    #7
    :eek: No idea to be honest.

    Are there two consecutive numbers anywhere in that serial?
     
  8. ewils19 macrumors 6502

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    #8
    Mine starts with DNQ so ours are similar.
     
  9. clarkgriswold macrumors member

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  10. f00f thread starter macrumors 65816

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    #10
    Very good point. Combination of build week and location could determine when and where there was a bad batch of batteries in the production lines -- if this is indeed the cause of the drainage.

    I'm sure the serial depicts the location but no idea how to decipher it yet either.
     
  11. mattydee87 macrumors regular

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    Aug 22, 2008
    #11
    First three characters? Well that's a bit of a fail for mine as the first 5 are letters, in fact there are only 3 digits in the whole serial number... Is that weird?

    Also the first few days my battery was shocking but today I'm down to 51% after 18 hours. Not bad indeed :D
     
  12. mikey2004 macrumors regular

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  13. i4Collin macrumors regular

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    #13
    Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)

    I don't think I'm having battery issues, but this morning, I unplugged my iPhone from my computer and the 100% with the plugged in symbol went immediately to 98% literally the second I unplugged it. Mine is a C38.
     
  14. f00f thread starter macrumors 65816

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    #14
    Perhaps the serials are carrier dependent? Not really sure; I don't think anyone has figured out how to decipher them entirely yet.

    The few posts I've come across on the 'net suggested the second and third characters are numbers and combined represent the week. Perhaps only for AT&T activated phones? Just a hunch. My AT&T handset serial only has two numbers in it.


    One sure-fire way to rule out the battery hardware is simply to put the phone in Airplane mode & put it to sleep. I've done just this and it hasn't budged whereas earlier it was dropped about 7% and hour.
     
  15. buddybd macrumors 6502

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  16. dr.devious macrumors regular

    dr.devious

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  17. f00f thread starter macrumors 65816

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    #17
    Any digits in that serial at all?
     
  18. verwon macrumors 68030

    verwon

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  19. Fusion79 macrumors 6502

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    #19
    I agree, I think this is a software issue. In airplane mode my battery does not budge.
     
  20. 7timethecrystal macrumors regular

    7timethecrystal

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    Mar 21, 2011
    #20
    DNP also on Sprint. No real discernable code in S/N that would reveal build week. Battery is AWFUL, particularly when it's sitting next to my work 3GS that also has iOS 5.
     
  21. deeddawg macrumors 604

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    US
    #21
    C37. Under Settings->General, Usage = 24 minutes, Standby = 1 hour 53 minutes, battery is 98%.
     
  22. reclusive46 macrumors 65816

    reclusive46

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    Canada
    #22
    I'm DNP on a factory unlocked UK 32GB white model.
     
  23. sgrrsh26 macrumors 6502

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    Jul 19, 2009
    #23
    Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)

    C39
    Drains pretty fast in use but I expect it would
    No standby issues. 2 % over night
     
  24. salacious macrumors 6502a

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    May 15, 2011
    #24
    are you sure this isnt anything to do with ios5? i remember on android tmobile g1 the battery was like a tire with 20 puncture holes in it, then after a update the battery was improved by 40% and i mean i went from 5 hours needing a charge to a whole day then needing a charge...
     
  25. ama0219 macrumors member

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    Oct 13, 2011
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    Greensboro, NC
    #25
    Mine is DNP on Verizon. There are no consecutive numbers. But my battery is at 74% and has been unplugged for 6 hours with moderate usage.
     

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