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My iPhone turns itself off when it has a lot of battery charge left, sometimes when it's still at 70%. Then I can't turn it on at all unless I plug it in to a charger.... After I do that, the apple logo appears and it turns on as normal with lots of charge.

Why is this happening?

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    What model is your iPhone? I had an iPhone 5 with faulty battery doing the same; Apple replaced those for free. – Jaime Santa Cruz Jun 24 '15 at 22:57
  • It is a 3G so quite old but has just started doing it. – Tina Ellery Jun 24 '15 at 23:01
  • Maybe you should think about replacing the battery. – Jaime Santa Cruz Jun 24 '15 at 23:02
  • Ok. Maybe that is the issue. But it holds charge? I don't know. Maybe I should go see an apple retailer... – Tina Ellery Jun 24 '15 at 23:05
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It appears your battery is faulty.

If you have an iPhone 5, check the iPhone 5 Battery Replacement Program to get a free replacement.

If you have an iPhone 6s, check the iPhone 6s Program for Unexpected Shutdown issues to get a free replacement.

If your phone is under warranty or AppleCare extended warranty, you may be eligible for a free battery replacement. Even if it is not under warranty, go to the Apple Support webpage, "Start a service request" and fill in your problem details so Apple can help you.

If you have a Mac, you can find information about your battery by plugging into your computer and installing the free CoconutBattery app to check its health.

CoconutBattery showing iPhone 5

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