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Ok. So my 6S was shutting down at around 30%. It was also only getting about 2.5 hours of usage before shutting down. So here's my story...

It took 2 Genius Bar appts to get a brand new phone. The battery was at 60% capacity per ibackupbot. The Apple rep tested it at 83%, which is passing. So he let me pay to get a new battery for $79. He stated if the new battery didn't work, they would replace the phone. And that's what happened. Walked out with a new white box phone. Hopefully this one works as it should.
 
I had been having this problem a while ago whilst using applications such as Snapchat and the camera. For about 2 weeks my phone has not shut off, which has been good, until yesterday, when I used the camera. It just shuts down when the camera is in use in any app (Snapchat, etc). I really hope Apple are working on a fix for this - I think it's the software, as mine was fine before on iOS 9, but dies on iOS 10.
 
I had been having this problem a while ago whilst using applications such as Snapchat and the camera. For about 2 weeks my phone has not shut off, which has been good, until yesterday, when I used the camera. It just shuts down when the camera is in use in any app (Snapchat, etc). I really hope Apple are working on a fix for this - I think it's the software, as mine was fine before on iOS 9, but dies on iOS 10.

Very weird. Have you tried a restore and setup as new?
 
Hi guys!

I've been running into this problem lately as well, as has been my wife. We purchased our phones on the same day.
While her's was shutting down repeatedly at 27 %, I didn't notice it with mine until the day before yesterday, when suddenly it shut down at 35 %.

I seem to have noticed this started occurring with iOS 10.1.1 first and while I was reluctant to update to the updated 10.1.1 (remember there was a re-release), I did so today. Maybe this helps?!
Otherwise this sure would be a dramatic flaw with the iPhone 6s. Wouldn't be the first time though, the iPhone 5 had something similar, remember?
But the more devices Apple sells, the more they'll have to replace in such a case - which means they will be even more reluctant to acknowledge a problem in the first place.
 
I will now try to turn off background app refresh completely, which was reported to work here in earlier posts. Frustrating :(
If you are going to try turning background apps refresh off, please, leave some feedback here. My iPhone 6S works fine after I've done this. Some of my friends did this too and for now they don't have any sudden shut-downs.
Apple suggests to use Low Power Mode. It's another option.
 
Well I'm down to 1% with normal useage. First time since I ran my battery down with Youtube and the torch.

running down your battery to it almost dies is horrible for lithium ion batteries. you should almost never do that.
 
running down your battery to it almost dies is horrible for lithium ion batteries. you should almost never do that.
Running down the battery to nothing isn't good but the device shuts off before the battery is actually empty. It's not to say that it's not something that has some impact on the battery, but it's not exactly horrible or anything like that, and certainly not if it just happens once in a while (vs. often and/or regularly).
 
running down your battery to it almost dies is horrible for lithium ion batteries. you should almost never do that.
Once or twice every two month is good to keep the battery gauge calibrated.

However, the best range to keep the battery in is from about 15-20 to about 80-85 %.
I have heard that overnight charging isn't to good for the battery either. Because it is kept between 90-100% for a long period of time.

What I can say is. I always use a phone for about 1 1/2 years and I have never had problems with my battery when doing about one charge circle a day, almost always plugging the phone in at 10 % or less and charging overnight.
 
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Once or twice every two month is good to keep the battery gauge calibrated.

However, the best range to keep the battery in is from about 15-20 to about 80-85 %.
I have heard that overnight charging isn't to good for the battery either. Because it is kept between 90-100% for a long period of time.

What I can say is. I always use a phone for about 1 1/2 years and I have never had problems with my battery when doing about one charge circle a day, almost always plugging the phone in at 10 % or less and charging overnight.
Technically speaking 40% - 80% is the optimal range, but realistically the time and effort spent on making sure of all that all the time is basically not really worth it. These days it's basically down to using the device as needed and charging as needed without much worry about this or that (mainly avoiding extremes essentially, at least in the sense of coming across those extremes often/regularly).
 
I spoke to an Apple Genius who confirmed that it was the motherboard not the battery that is faulty. Unfortunately since I got the Phone from a carrier in europe, they cannot change it for me since apple warranty is 1 year and expired last month
 
I always tend to upgrade every two years so next year's model will be intriguing. Is it the anniversary model up next? In the meantime, I hope the software update fixes this. It's getting annoying. I've never had so much battery trouble in my years of owning Apple products.
 
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I got mine from o2 in the U.K, but always go to an Apple Store for problems.

I bought mine from O2 and mine is now older than a year and that I should go back to Apple because O2 does not honour the Eu consumer law. Sounds ridiculous but this is what they told me.
 
I bought mine from O2 and mine is now older than a year and that I should go back to Apple because O2 does not honour the Eu consumer law. Sounds ridiculous but this is what they told me.

Goto apple and they should honour the eu consumer law as it's a manufacturing defect.
 
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