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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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Weird battery drain issue

Hello, im having a weird battery drain issue since a while and hope someone guides me into the right path!

Some info before the main question:

1- my phone was taken apart to do work on the front facing camera (issue didnt start right after though, id say 6 months later)

2- all notifications are off, mail is fetching manually, location is off, hidden location is off.. Etc, etc..

3- screen brightness is below half and off for auto brightness

4- background app refresh is off

5- everything that makes the phone inteligent is actually off

6- batery drains with airplane mode on

7- battery is draining around 45% overnight (7-8 hours~) whith airplane mode off or on.

8- performed all settings reset, network reset with no luck

9- never done a full restore with itunes

10- performed the battery usage and standby track down and everything seems normal, night and morning screenshots are good without any track of phone not sleeping well. Its going to sleep all the time its on standby.

11- changed the battery..... Bought a cheap one of the bay and changed it myself, problem is still present exactly the same as before.

One thing id like to mention, i was using a generic charger overnight, the next morning after battery change eventhough it was hooked all night on said charger and was charging, phone was dead in the morning and took a good 30 minutes to wake up after hooking to an apple wall charger. After this, phone seems to have same battery drain issue as before.

Conclusion: does this generic charger have something to do damaging my original battery and then the cheap one i bought and changed myself?

Questions:

1- will any hardware part of the phone cause battery drain? Such as dock port?

2- will a loose connection somewhere drain battery? Such as screen flexcables? These where never removed when i changed the battery, screen was held at 90 degrees angle all the time.

Im afraid to buy another battery and still dont fix the issue... Any help is greatly appreciated..

Thank you..

Answer this question I have this problem too

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6 Answers

Suppose the first step would be to completely wipe the device by restoring it to factory and not using a backup. Then ensure the sim is removed, charge it to 100% with the Apple charger then leave the device in standby overnight in flight mode and see how the battery behaves.

If it still drains excessively there maybe a hardware issue. If it's better then reintroduce things back one by one to see when the performance changes, avoid doing a system restore.

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given you say generic charger then i would bet that your "U2IC" is done for. it will need it replaced which is a main board repair only for specialists.

personally this is the only avenue i would be going down. Google iPhone u2ic and you should get a better understanding. its very common with cheap chargers

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I read some, but actually my phone charges good no matter if its completely dead or have some juice left, it takes the normal to fully charge from 0 to 100 in around 1:30-1:45 hours. My phone doesnt get the slightest hot when using nor charging.. My phone charges normally when using and connected to power, example playing a game and connected at the same time. I have two original chargers which im using atm and some generic usb cables and 12v sockets for the car. Everything is working as it should on the phone... Just this problem of battery drain while using and while not using the phone. Does that u2ic make the battery drain faster if its bad?

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yes U2 ic failure does indeed cause battery drain. . 12v car chargers are also a major cause of this

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In my experience, cheap batteries often give cheap results. If nothing else works, try one with higher quality. We have, many times, replaced bad batteries with a new one which resulted in the phone having _less_ battery time.

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Following up, i changed the cheap bay battery with one from ifixit. Restored the phone and woke up as new, tested it and nothing.... Still drains around 40-45% on standby with airplane mode on.

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Hi, I have an identical sounding problem that was not resolved by changing the battery to a new Apple one. Did you find the cause / a solution?

Cheers

Chris

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Nope, still draining, i gave up. I bought an external battery/case which i use all the time.

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ah thats frustrating!

I'm guessing you've done this already, and it didn't work for my phone, but in case you haven't...

the senior technical advisor said to go into iTunes and select Restore iPhone (not restore backup) - which apparently re-downloads the whole iOS and installs it again rather than just resetting via the iPhone which he said does not refresh the iOS install

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Yes, thats how i did my restore, plus when phone was up i didnt install all the apps i had before, i cut like 20 of them id say.

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It's because of u2 ic

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Have this same problem was definitely because of a faulty charger for me as I did it to two phones! First phone IPhone 6 continued to try and use faulty charger eventually phone with severe battery as described above would not charge at all. Upgraded IPhone 7 used same charger and noticed it shut down phone when first plugged in. Realized something wrong and stopped using charger. Phone works normally except it now also has severe battery drain! Just sent it away for u2 ic (tristar) replacement. Will report back when it is confirmed fixed. Be careful with crappy chargers especially cigarette lighter adaptors! I believe they allow too much amps threw to phone caus8ng damage to tristar chip which has many symptoms with one being severe battery drain even while in standby mode airplane mode etc.

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So guys any solutions of that problem, because i have the same problem, i had oryginal battery and just went dead one day so i bought apple battery i replaced that and , still draining my battery iphone is holding less than 10 hours on standby, but i did notice as well that charging time is huge as well from 20%-80% i took me over 5,5hour. Do you think that i should replace charging port as well maybe that’s the problem as well, because when i was contacting with apple service they told me that that’s the hardware issue, but what could be?

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Haven't found the fix yet, but there is definitely a hardware issue with some phones (iPhone 6). I upgraded my sons phone, so I now have 2 iPhone 6. I have restored the same image to both phones. Both have new batteries, which I have moved from one phone to the other, to be sure one battery isn't bad. My sons old phone (which has seen 10 times more abuse than my phone) lasts 60 hours on a full charge. My phone won't last 12 hours. This measurement is with the phone on, no apps open.

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