9 Replies Latest reply: May 21, 2012 10:47 AM by masz_fant
Morac Level 1 (100 points)

Has anyone noticed the displayed battery percentage being incorrect?


I've seen a couple of examples.  Once when I let my iPhone 4S drain down to 1% and then continued to use a GPS app for another 20 minutes until the phone turned off.  Another example was last night when my iPhone 4S charged up to full at 96% (notice the plug ni the battery indicator).



iPhone 4S, iOS 5, AT&T 32 GB
  • wjosten Level 10 (94,210 points)

    Recalibrate your battery:


    Let the battery drain on its own until the phone shuts off. Then charge to full. Do not do this more often than every 2 ~ 3 months or so.

  • Morac Level 1 (100 points)

    I did that last week.

  • wjosten Level 10 (94,210 points)

    Well, there is no other setting/procedure to recalibrate the battery. I would not recommend going through the option of restoring as a new device, but if it bothers you that much, that's your only option left.

  • Morac Level 1 (100 points)

    I fixed it by doing a reset on the phone, but it happens more frequently than I'd like on my iPhone 4S.  It might be related to Springboard crashes (which also happen occasionally).  The phone is not jailbroken.




    Apparently this is a common problem.  See https://discussions.apple.com/message/16430960#16430960

  • wjosten Level 10 (94,210 points)

    Wait for iOS 5.1(in beta right now), I can't discuss anymore than that .

  • sigsauer Level 1 (0 points)

    this happened to me today.

    FYI, you have to restore via iTunes. connect your iphone and do a restore.

    this will resolve the issue since it will reinstall ios5.01.

    hopefully this problem will be resolved in next update 5.1

  • imark89 Level 1 (0 points)

    This was happening to me - i charge my iphone 4s whilst i was sleeping wake up and it will always be 93% charged. So i let my phone fully drain twice, and now its working fine. There is a more technical term for this but i cant find the article.

  • masz_fant Level 1 (0 points)

    hey morac, could you please specify what reset you're referring to, and each step in order to fix the problem?

    I have been experiencing the same problem, although I am currently using newest iOS on my iphone 4s 64gb. I have tried battery calibration and restore but they don't work out for me. thanks!

  • masz_fant Level 1 (0 points)

    additional info:

    after recalibration my battery able to fully charge to 100%. but the percentage indicator still inaccurate. I compare it to my battery+ app. when the indicator shows fully charged, in contrary the battery app still shows the battery charge not done yet and need less than an hour to fully charge. so the question here is how to get the software percentage indicator back to be accurate again.


    hope others can help too. thanks.