Iphone 8 turns off almost fully charged

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Level 1

8 points

Iphone 8 turns off almost fully charged

Hello. I have a big trouble these days. My new iPhone 8 (i have it for 3 months) is crashing on high battery level. I have like 85% and phone shuts down with reason that battery is dead. Sometimes, phone just restarts at 80-90% and starts again with 9% (always 9%) and in few seconds turns off. When i plug the phone in again, it starts charging at 80-90%. Not at 0. When it starts at low percentage sometimes, it is charging very fast, and it stucks at 50% for like an hour and then it continue really fast back to 100%. I can't even leave house without powerbank and it's really anoying. This problem starts a week ago. I tried almost everything what i find useful.

I would like to get your answers. Thank you a lot for support.

iPhone 8, iOS 11.2.6, battery crash

Posted on Mar 25, 2018 3:33 AM

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Answer 1

Top-ranking reply

ProustGiulio

Level 10

209,838 points

Mar 25, 2018 1:32 PM in response to simonkazda

Thanks for sharing your experience, simonkazda.

What to say?... it's really difficult (for me) to diagnose your issue remotely, and I really would like to understand if it is a hardware or software problem.

When, on my previous post I wrote:

....Or you can try and install a fresh copy of iOS, restoring your iP8 to factory settings.

To perform this operation, make a full backup of your iPhone, then follow the steps provided in this support guide, and at the end set it up as new:

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

Test your device, then restore your data from your previously made backup....

I forgot to point out that you should test your iP8 for a while (maybe for some hours) before restoring your data from backup.

In that situation, your iPhone is empty, restored to factory settings, it's using only apps that come along with iOS, without any data, and, if you still have crashes at 85% of your battery capacity, then... it should be a hardware issue (and your iphone is still under warranty). Go to the Apple Store and demonstrate your issue.

On the contrary, if your iPhone works fine (without crashes) in such situation, then it could suffer from software (apps) or data, or settings problems coming from your backup. You can verify it after restoring from your backup.

What to do?... you don't have many options: you can survive with the crashes (not recommended) or you can try to find/investigate what setting, what apps, what data are causing your issue, adding them one by one....

I don't see any further suggestions, sorry.

Maybe at Apple Store you'll find a technician who can better help you.

Please keep me informed.

Thanks and regards

Giulio

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Answer 2

ProustGiulio

Level 10

209,838 points

Mar 25, 2018 4:28 AM in response to simonkazda

Well, you can try other basic troubleshooting steps:

Force restart your device: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then, press and hold the Side button until you see the Apple logo.

Or you can try and install a fresh copy of iOS, restoring your iP8 to factory settings.

To perform this operation, make a full backup of your iPhone, then follow the steps provided in this support guide, and at the end set it up as new:

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

Test your device, then restore your data from your previously made backup.

If nothing helps... your iphone needs to be inspected. Those crashes are not normal.

Regards

Giulio

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Answer 3

ProustGiulio

Level 10

209,838 points

Mar 25, 2018 3:53 AM in response to simonkazda

If you've already tried to charge your iP8 normally (not wirelessly), changing the cable, change the wall socket, putting it on charge via USB connected to your MAC/PC, and nothing changes, I would contact your most convenient Apple Store or Authorized Service Provider and have your device inspected.

Apple - Find Locations - Location Selector

Regards

Giulio

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Answer 4

simonkazda Author

Level 1

8 points

Mar 25, 2018 4:00 AM in response to ProustGiulio

Hello, i think that this is not kind of problem. Maybe just display battery bar is doing a mess. There is a problem that my iP8 always turns off, or crashes at 80-90% of battery. I have not problem with charging it.

I also tried the Apple Store and they said me that the battery is still at 91% condition what is not bad.

Thanks.

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Answer 5

simonkazda Author

Level 1

8 points

Mar 25, 2018 4:29 AM in response to ProustGiulio

I tried force restart few times in this week. I also tried to restore ios via itunes on computer. Do you really think that restoring iP to factory settings will help, when normal ios restore via itunes didn't? Yes, those crashes are not normal and I really don't know what is going on.

Thanks for your time, I will try what you said again.

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Answer 6

simonkazda Author

Level 1

8 points

Mar 26, 2018 11:37 AM in response to ProustGiulio

Thanks for your time and advice.

I really can't understand this problem. It started after i got snapchat update a week ago. Now, it crashes almost everytime when I open snapchat without being connected to charger, but when my battery goes down to 70-80%, it starts crash with opening default iP maps, instagram, default iP wallet application, facebook, messenger etc.. These aps are for me very important and i can't imagine a social life on my phone without them. I tried reinstall snapchat, but it didn't worked.

I am really annoyed by this. I can't even go for a new one by replacing this, because I am leaving tomorrow for a bit longer period then a week, and I really need my phone in full condition.

Thanks for your time and your help. I really appreciate it.

Šimon

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Answer 7

simonkazda Author

Level 1

8 points

Mar 29, 2018 9:05 AM in response to ProustGiulio

So, i tried almost everything now. I tried contact a snap support as well but they did not respond. Did you find any possible reasons why? I am really done with this problem. I am out of country and i need my phone the most but can not even use it without charger connected.

If you find something useful, please contact me.

Thanks.

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Answer 8

simonkazda Author

Level 1

8 points

Mar 25, 2018 12:49 PM in response to ProustGiulio

I tried to go to iStore and they said me to try the DFU mode. I tried it and I restored data from backup and it seems that it will work perfectly but battery crashed again at 85%. I am really done..

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Iphone 8 turns off almost fully charged

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