iPhone Battery Percentage off by 4%

Discussion in 'Jailbreaks and iOS Hacks' started by ntegra, Feb 26, 2013.

  1. ntegra macrumors regular

    Joined:
    Oct 10, 2010
    #1
    Anyone know what might cause this?

    My battery was at 17%, clicked over to 16% and I got the "20% battery life remaning" notification.

    Anyone else have similar problems?
     
  2. lucastatic macrumors regular

    Joined:
    Jan 25, 2013
    #2
    The displayed battery percentage is a rough estimate, and you will notice slight variations especially after respringing due to the phone recalibrating. This is all normal as it is impossible to pinpoint the exact charge of a (lithium-ion) battery :).
     
  3. bun.bhay macrumors member

    Joined:
    Dec 6, 2011
    Location:
    Seatown
    #3
    i have the same issue as well. using batterydetective shows battery charge at roughly 80% whereas the status bar shows full charge.

    device: iphone 4s
     
  4. eelw macrumors 6502a

    eelw

    Joined:
    Sep 19, 2012
    #4
    Well this is slightly different. The percentage indicated by battery detective is based from designed battery capacity. The battery indicator in the status bar is based on current capacity.
     
  5. dasx macrumors 65816

    dasx

    Joined:
    Jun 18, 2012
    Location:
    Barcelona
    #5
    Just do a recalibration.

    (Let the battery die, let it rest for 8h and do then a FULL charge)
     
  6. lucastatic macrumors regular

    Joined:
    Jan 25, 2013
    #6
    I'd rather just let it die, then recharge. I've heard letting it sit empty causes crystals to form in the battery and that that decreases potential charge. 8 hours seems a little much.
     
  7. BumpyFlatline macrumors 68030

    BumpyFlatline

    Joined:
    Apr 11, 2012
    #7
    Lithium ion batteries are best served to keep the electrons constantly moving. Therefore letting it sit completely dead for any extended period of time is really bad for the battery's health.
     
  8. dasx macrumors 65816

    dasx

    Joined:
    Jun 18, 2012
    Location:
    Barcelona
    #8
    Yeah well, Apple knows better I think:

    Source: Apple.
     
  9. BumpyFlatline, Feb 27, 2013
    Last edited: Feb 27, 2013

    BumpyFlatline macrumors 68030

    BumpyFlatline

    Joined:
    Apr 11, 2012
    #9
    Yea well, way to twist my words. I never said letting the battery drain and then recharging to 100% is bad. In fact I do this once a month, per apple's guidelines. I said "letting the battery sit dead for an extended period of time is bad for the battery's health".

    1 of many sources:
    http://techtips.salon.com/calibrating-iphone-battery-25346.html

    Calibration
    "To maximize the benefits of the iPhone's lithium-ion battery, lessen its disadvantages and keep the battery meter accurate, calibrate your iPhone every month or so by allowing it to fully discharge. After the iPhone shuts off, recharge it without interruption until it reaches 100 percent of charge. This keeps the battery's electrons moving, increasing its overall health, and recalibrates the battery meter to accurately display the charge."
     
  10. lucastatic macrumors regular

    Joined:
    Jan 25, 2013
    #10
    So what exactly did you prove with that quote from Apple's site?

    Here's your post with less words:

    Quote 1
    Quote 2
    Proof leaving your battery dead for several hours isn't bad!:
    ...I'm not sure I see your logic. And for the record I fully drain my iPhone one to two times per month because I know it is recommended and I know it is 'good' for the battery. :p
     
  11. B2FiNiTY macrumors member

    Joined:
    Nov 28, 2011
    #11
    Most likely, everyone is referring to this comment. :cool:
     
  12. BumpyFlatline macrumors 68030

    BumpyFlatline

    Joined:
    Apr 11, 2012
    #12
    Thanks. That's all I was trying to say. I don't want people accidentally ruining their batteries because of false information on this thread. I take a lot of pride in picking my spots where I'm knowledgeable and I post feedback to help fellow members. Recalibration is a good thing to do monthly. I always do it and my battery life is terrific. Nearly as strong as when I first got my 4S a year ago.
     
  13. LithePanther macrumors 6502

    Joined:
    Sep 22, 2011
    #13
    I re-calibrated the other day for the first time in months and noticed a large increase in battery performance. Already put in calendar to do it bi-weekly
     
  14. TG1, Feb 28, 2013
    Last edited: Feb 28, 2013

    TG1 macrumors 6502a

    TG1

    Joined:
    Feb 21, 2011
    #14
    Battery Percentage off by 4%

    I have the BatteryCenter tweak installed in my notification center and I just noticed that it's reading three points lower than what's reported in my status bar (55% vs 58%). Weird.
    [​IMG]
     
  15. CosmicDice macrumors member

    Joined:
    Jul 24, 2011
    #15
    When iPhones battery is 0% and it shuts down, the battery is not empty! This goes to all cellphones that uses this kind of battery. That saves the battery from been ruin as theres allways little power in battery.

    You can and should drain you iPhone to the point that it shuts down and do a full charge circle ones a month
     
  16. Redjericho macrumors 6502a

    Joined:
    Sep 16, 2011
    #16
    You think that's bad?
     

    Attached Files:

  17. ominx macrumors 6502

    Joined:
    Jun 23, 2010
    #17
    Wow 216 cycles? I thought mine was high at 58. It was my understanding from reading Apple's support pages that it is best to keep the battery topped off as much as possible to avoid full cycles and then perform an intentional cycle once per month. That's what I've been doing since the iPhone 3G and I've been happy with the performance and reported accuracy.
     
  18. dasx macrumors 65816

    dasx

    Joined:
    Jun 18, 2012
    Location:
    Barcelona
    #18
    So I got under your skin because of the 8h comment? OK guys, I'm so sorry and I apologize to any forum user who now has a dead phone due to my post.
     
  19. LithePanther macrumors 6502

    Joined:
    Sep 22, 2011
    #19
    Spreading poor information isn't welcome anywhere.
     
  20. lucastatic, Feb 28, 2013
    Last edited: Feb 28, 2013

    lucastatic macrumors regular

    Joined:
    Jan 25, 2013
    #20
    +1
     
  21. TheShadowXX macrumors regular

    Joined:
    Sep 29, 2012
    #21

    what theme is this? it's really nice.
     
  22. hackthatphone macrumors 68000

    hackthatphone

    Joined:
    Jul 28, 2010
  23. dasx macrumors 65816

    dasx

    Joined:
    Jun 18, 2012
    Location:
    Barcelona
    #23
    That still has to be proven. None of you guys has post a single link to a reliable article stating that leaving a battery "dead" for 8h is bad for it.
     
  24. TG1 macrumors 6502a

    TG1

    Joined:
    Feb 21, 2011
    #24
    Nothing special. Ayecon theme with NC Settings, Battery Center, and Handcent SMS. Font is Klill using Bytafont.
     
  25. Tiptizzle macrumors 6502

    Joined:
    Apr 22, 2011
    #25

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