iPhone iPhone 5 dead but battery says 30%

Discussion in 'Jailbreaks and iOS Hacks' started by Makaveli6103, Feb 20, 2013.

  1. macrumors 6502

    Jan 31, 2009
    Kansas City, MO
    Recently I noticed that my phone goes dead at 30% and will not turn on unless I plug it in. I have ios 6.1 jailbroken. What is up with this?
  2. macrumors 6502

    Jul 6, 2011
    Have you tried recalibrating the battery? By that I mean letting it drain until it turns off and then recharging it fully before using it again.
  3. macrumors 6502

    Sep 9, 2010
    Did this happen prior to your JB? If not I would say do a complete restore and JB again to the latest 6.1.2 and Evasi0n 1.4
  4. macrumors 6502

    Oct 11, 2011
    The best way to keep your battery calibrated is to only plug it in when it goes under 20% and then to charge it completely to 100%, without interruption.

    If you keep doing "shallow charges", ie. charging your phone when it's like at 50% or higher and then unplugging it before it hits 100%, the charge meter will become slowly inaccurate over time.

    As mentioned above, best way to recalibrate it is to let it run out completely and then to charge it overnight to 100% and just leave it charging for a couple hours.

    The phone will automatically activate "trickle charging" when it get's to 100% so it never actually overcharges your battery anyway.
  5. macrumors member

    Sep 19, 2012
    guys not to sound like a dick but he/she did mention it shuts off at 30% so how can they recalibrate it if it dosent go down to 0%
  6. macrumors 6502

    Jul 6, 2011
    Well obviously not, it was worth a try though. I assumed they might as well try that before they restore. I don't know what jailbreak tweaks he has installed but it can be a PITA to install a lot of tweaks after a restore. Also assuming the system is reading his battery incorrectly (and that it is just not a faulty battery) I thought that it might help.

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