Iphone 4 auto shut off when battery 20% and lower.

My Iphone 4 auto shut off when battery 20% and lower. The phone is only 1.5 years old. Can I know why this happen?

Most commom reason for this is faulty battery. You could try Restore with iTunes on computer, at end when prompted, Set Up iPhone as New. If still problem and you have AppleCare, take to Apple for resolution. If no coverage, make Genius reservation and take to Apple Store for quick free battery diagnostic testing.

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    Fully discharge the battery (till it shuts down and won't turn on) and then fully recharge it (100%).  This will recalibrate the battery meter.  You may need to do this a few times.

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    Hello Caddilacman,
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  • Phone shutting off when not using and does not start back up by itself

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  • Iphone 5 random shutdown when battery is not low?

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    Hi Dcp019,
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    iPhone: Hardware troubleshooting
    http://support.apple.com/kb/ts2802
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    Nubz

  • IPhone 5 shuts off before battery depletion

    My iPhone 5 is starting to shut down around 23%. What's up with that?

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    http://www.apple.com/support/contact/   (Choose Get Started using the link to the left)
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