Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus.

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My iPhone suddenly turns off at 90% of battery

I bought my phone in 2014 and suddenly battery drains A LOT faster than usual. But i'm not sure whether this problem is related to battery or logic board. :(

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Considering your phone is nearly 3 years old, I would change the battery first.

If you have a Mac, download coconutBattery to test your battery. On a PC, download 3uTools. Look at the design capacity or design maximum charge. If that number is lower than 80%, then your battery should be changed.

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