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My 6 is having this issue. Yesterday my phone went from 30% to 10%, to 1%, then promptly died. Plugged it into an outlet and immediately jumped back to 30%. When this happened with my iPhone 5, I just brought it in to Apple and they ran diagnostics on the battery to test that it was failing. That was under the replacement program though so hopefully they recognize that this is a problem on the 6 as well.
 
Weird, just this past weekend my iPhone 6 battery started misbehaving; Granted it's over 2 years old now, but I kept my 4s for even longer and it never had such issues (it obviously lost capacity but stayed consistent).
I spent $80 in December to have my iPhone 6 Plus battery replaced. Hopefully I can get a refund.
 
I am pretty sure the iPhone 6 has flawed battery as well, at least mine went from OK to bad during the first year. Could not use it in cold weather at all, just shut down. I've been using iPhone since the start and the battery in none of my previous models had ever been that bad.

I've given up waiting for Apple and paid for a battery replacement myself. Huge improvement. Now I can take pictures of the beautiful winter in northern Sweden yet again!
 
my iPhone 6 battery has been very bad for 15 months now.
Tried everything.
took it in for a service under warranty, they said its fine. no problem.
turns off at 50%, it needs charging, i plug it in and it turns on with 50%+ battery.
It gets on 10% very fast, even on 1% in a few hours and might stay there for a couple hours.

this should have been covered as the 6s
 
Mine was fine till I upgraded to iOS 10.1 I've bought an Anker battery case for now in the hope Apple will sort it. Problem is I'm a freelancer in TV so my phone is vital to work, and its starting to get annoying!
 
My iPhone 6 plus was swapped out due to battery performance, and now my wife's iPhone 6 has the same issues at 20 months old. I hear a lot of people with iPhone 6 battery issues.
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Mine was fine till I upgraded to iOS 10.1 I've bought an Anker battery case for now in the hope Apple will sort it. Problem is I'm a freelancer in TV so my phone is vital to work, and its starting to get annoying!

If its "vital" to your work, just like the data for your computer, you should have a backup. Not just because of any technical issues, but also because of loss or theft. Maybe you backup can be a dumb chockie block for calls, maybe a 2nd iPhone. I keep my previous generation for exactly that reason.
 
would welcome the replacement had it been real. had my iP6 since launch and it's been fine. no issues here other than the home button becoming "loose" at times but doing the alcohol trick works temporarily. skipped the 6s and 7, hopefully the 7s/8/x/10yr iPhone blows me away. bigger battery please.
 
In under a year my 6's battery was acting up. It would read 25% and then shut off randomly. I'd plug it in and it would jump to 30%+ charged immediately. Brought it in and they said there was no issue and they can't replace it because they saw no issue.

I brought my 6s in with the same issue (it would die at around 17%) and they replaced my battery after the issue persisting after a DFU reset.
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When I had my 6 this was also what I experienced. I would have about 50% then it would shut off. I tried to start it up but it would tell me to charge it as it was dead. If I waited a few minutes and try to do a force reboot it would boot up, show that I had more % battery than before but then turn back off after a minute or 2. Plug it in and it would drop 10% from earlier reporting then jump back up. Very strange. Apple said nothing wrong from their diagnostics.

I think this is a issue with battery calibration rather than the battery itself. I had the same issue and there were no red flags when I brought to the Apple Store.
 
I have a friend who definitely has battery problems on his 6. Not unlike my iPhone 5 which did qualify for Apple's program (but that's running iOS 6 so I had to replace the battery myself).
 
In under a year my 6's battery was acting up. It would read 25% and then shut off randomly. I'd plug it in and it would jump to 30%+ charged immediately. Brought it in and they said there was no issue and they can't replace it because they saw no issue.

just keep at it...eventually they will replace just to get rid of you. if it's in warranty at least
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Every smartphone should have its battery replaced after two or so years. It would be nice if Apple let people know that this can be done and it isn't that expensive. Of course Apple might sell less new phones then.

quick google search of "apple battery replacement" yields: https://support.apple.com/iphone/repair/battery-power
 
It isn't free. But I suspect if you keep your receipt and show it when you sell the iPhone down the road you will recoup a piece of that, maybe even half of it. I'd say if you are being frugal and sticking with a 6 for another year, you could treat yourself to a new battery.

Still not something I'd be happy to pay if there is another issue at play.

I also never sell old phones (usually keep them as spares or repurpose them) and my current contract is up in August so I don't know if I'll be getting a new phone (don't plan to but depending on what I'm offered).
 
This just happened to my SE last week. Turned itself off at 35%, then showed the "dead battery, connect iTunes" when I tried to turn it on. Upon power connection it booted at was immediately at 30%.

Battery is still at about 86% design capacity with 250 cycles.

Last night the discharge was highly non-linear though - the last 20% dropping very quickly. I'm sure the cell ESR is going up. I what annoys me most is if this it's an intermittent problem, unless there are enough complaints, Apple and its reseller rep here in my country will just ignore it, or claim that this is expected behaviour after 1 year of use.

dead battery and "connect to iTunes" screen are different and mean different things....which is it
 
There should be, my iPhone 6 shuts down ALL THE TIME with about 30% battery life. Totally unreliable and because of it the worst phone I have ever owned. I don't care how thin it is if it doesn't work when I need it.

how long ya had it? you do know that all electronic devices with batteries have limited lifespans? if the phone is 2+ years old your battery is probably just used up, like a car battery, or the batteries in your remote. might want to have it tested before jumping to conclusions and blaming the manufacturer
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Whether its a bug or the battery, neither have been fixed nor addressed as a problem

#FAIL

Apple is just a crapshoot lately. Pathetic as I loved their products.

it's not "lately..." this has been going on for years. because its not apple, it's battery manufacturers. did they not address the faulty battery problem by issuing free battery replacements for those affected?
 
Every smartphone should have its battery replaced after two or so years. It would be nice if Apple let people know that this can be done and it isn't that expensive. Of course Apple might sell less new phones then.
This seems to be one of the largest battery misconceptions. People think an iPhone has to be replaced just because the battery is poor. If somebody doesn't want to pay Apple $80 to replace it, it can be done yourself for about $20 (or less) and 15 minutes of time.
 
I am glad this came out as my 6 Plus started acting up since past month and a half around. It will shut down unexpectedly with the battery well over 20%
 
This seems to be one of the largest battery misconceptions. People think an iPhone has to be replaced just because the battery is poor. If somebody doesn't want to pay Apple $80 to replace it, it can be done yourself for about $20 (or less) and 15 minutes of time.

You are right, this would be probably the easiest way, but....

If people spend a lot of money for an iPhone, which should have an extra ordinary build quality, then the people not expecting such issues and if an issue occurs by insufficient components, the manufacturer schould fix it free of charge.
 
Did the same as with my 5, just installed an $8 replacement off Amazon and back up and running. When they finally had a program for the 5, they sent me a check to compensate me for my own home repair. Should've charged them labor.
 
My 6 is having this issue. Yesterday my phone went from 30% to 10%, to 1%, then promptly died. Plugged it into an outlet and immediately jumped back to 30%. When this happened with my iPhone 5, I just brought it in to Apple and they ran diagnostics on the battery to test that it was failing. That was under the replacement program though so hopefully they recognize that this is a problem on the 6 as well.

Being the iPhone 6 is no longer in production and Apple confirmed there is no recall in place for the iPhone 6, there won't be any battery recall Program.
 
I'm very impressed about the battery life of my 6, two years and a half and still full fit my daily needs with one full charge.

All though, my wife had the battery problem with an iPhone 5 and Apple didn't replace it cause a very little crack on the screen (and the Phone was elegible). She has now an 6S and again has the same problem of sudently poweroff but this time Apple says that is not elegible for a replace after serial number check.
 
I believe this is a software bug. I had two separate iPhone 6 do the same exact thing not long after an update a while back. I was hoping that an iOS update would solve it, but so far it's been a couple updates and still same issue.
 
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This seems to be one of the largest battery misconceptions. People think an iPhone has to be replaced just because the battery is poor. If somebody doesn't want to pay Apple $80 to replace it, it can be done yourself for about $20 (or less) and 15 minutes of time.

I used to do that myself starting with iPods. But the 5s was the last one I opened up. It was hard and I decided I'd not try to do it again. The water proofing is something that is easy to mess up. So I think my days of self replacement are done.
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Still not something I'd be happy to pay if there is another issue at play.

I also never sell old phones (usually keep them as spares or repurpose them) and my current contract is up in August so I don't know if I'll be getting a new phone (don't plan to but depending on what I'm offered).

Yeah it would be bummer to spend the money and then not see any benefit. Still it is something to consider. I normally hand down my iPhone in my family. So I've been getting four years out of them in general, but often with one battery replacement (which I used to do myself) done sometime between year two and three.
 
It's funny, my iphone 6 has this issue. In cold weather at 30% battery life it dies.
In cold weather lithium ion batteries can do that, it's not so much of an "issue" (as basically the one that mostly gets discussed) as it is a limitation and nature of the materials involved in the battery technology (which is standard across many devices these days).
 
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