Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus. Identifiable by the model numbers A1549, A1586, and A1589.

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iPhone keeps shutting down


The iPhone 6 I replaced the battery on keeps shutting down and restarts. Maybe 5-10 times a day.

I have tried to replace the battery, and tried to restore it but it keeps doing it.

What can I do?

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You need to determine if the battery is being charged and capable of holding a charge.

Use a battery utility, such as coconutBattery (for Mac) or 3uTools (for Windows). It will tell you what the health of the battery is. Anything less than 80% of design capacity will require replacement.

If you have access to a USB Ammeter, you could use that to determine if the phone is really drawing current when it says it's charging.

If you have access to a multimeter, measure the voltage of the battery. A fully charged battery should read 4.2V.

It is also possible that the problem is with the charge circuit on the logic board but first we need to determine if the battery is at fault. Get back to us with your findings so we can give yo more guidance.

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Hi again!

I have tried to connect it to Coconutbattery, and it says that it is 100% capacity.

I don't have the other stuff yet. :(


Hi again! I replaced the battery and everything worked fine when I had the phone. When my customer got it back he says that the problem is back.

It dies at 15-20% battery, and wont start until he connects the charger. It works perfectly with the charger connected, but tries to reboot with no success when not connected after a while. Sometimes it dies even at 60% and wont start until charging.

Is it something i have broke in the motherboard? How to not do that next time then? And how to fix it?



Was this the original problem? Or did this only start happening after you replaced the battery? Also, does coconutBattery say it is charged at 100% capacity or that the design capacity is at 100%. That is an important distinction.


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