Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

iPhone 8/Plus 11.2.5 bad battery performance

1rottenapple

1rottenapple

macrumors 601
Original poster
Apr 21, 2004
4,872
2,887
Anyone else notice their battery taking a big hit? I’m at work I was 90% at 9am. All of a sudden I was at 57% by 12pm. It’s 4pm now and I’m at 37%.

My 8 Plus usually has 70% at the end of the work day
 
No, can’t say that I’ve seen that at all on my 8 Plus. What do your battery stats look like? That is, what appears to be using the most power? Is something running a lot in the background?
 
Not seeing this. Although I’ve seen sudden drop once when I was out late at night.
 
Check out my Battery usage. It is the best I have ever seen.
 

Attachments

  • IMG_2785.PNG
    IMG_2785.PNG
    226.6 KB · Views: 262
My wife got an 8 four or five weeks ago. I set it up for her at the time, restored it from a backup of her previous 6S, and all was well until a few days ago.

She always charges it at night and starts out the day with a full charge, and honestly doesn’t use it that much at work. However, whatever happened, she was was suddenly coming home with only about 25-30% left in the battery, rather than the usual 70-80%. I updated it to the latest version of iOS, but no better. I’ve turned off as much as a can think of, tried resetting the network settings, but no better. Today we saw the battery drop from 50% to 4% in approximately 90 minutes. The phone wasn’t even being used in any way during that time.

This evening I have wiped the phone, and set it up as new to see what happens. Seems odd it was behaving perfectly up until a few days ago, then seems to have gone a bit haywire. There was nothing changed about the phone (new apps etc.) to explain the dramatic change.
 
bigscotal said:
My wife got an 8 four or five weeks ago. I set it up for her at the time, restored it from a backup of her previous 6S, and all was well until a few days ago.

She always charges it at night and starts out the day with a full charge, and honestly doesn’t use it that much at work. However, whatever happened, she was was suddenly coming home with only about 25-30% left in the battery, rather than the usual 70-80%. I updated it to the latest version of iOS, but no better. I’ve turned off as much as a can think of, tried resetting the network settings, but no better. Today we saw the battery drop from 50% to 4% in approximately 90 minutes. The phone wasn’t even being used in any way during that time.

This evening I have wiped the phone, and set it up as new to see what happens. Seems odd it was behaving perfectly up until a few days ago, then seems to have gone a bit haywire. There was nothing changed about the phone (new apps etc.) to explain the dramatic change.
Click to expand...



A few things that come to mind did you make sure your background refresh for your apps is turned off? All of your different location settings are turned off? Sometimes find my phone and iCloud Drive turned on could cause. battery drainage. Also is your roaming data off?
 
Jccutz said:
A few things that come to mind did you make sure your background refresh for your apps is turned off? All of your different location settings are turned off? Sometimes find my phone and iCloud Drive turned on could cause. battery drainage. Also is your roaming data off?
Click to expand...

Thanks for the reply. Yup, made sure that background refresh was off, and limited as many of the location services as I could. I didn’t turn off roaming data, or find my iPhone.

Today was the worst we had seen it. As I say, went from about 50% to 4% in about 90 minutes, while just sitting in her handbag.

Will see what setting up as new achieves tomorrow once it’s charged fully again. To be honest, I’m kinda hoping it’s still the same and that there is indeed a fault with it. At least that way she could get booked in at the local Apple store and get a replacement.
 
Well, if anybody is interested, it seems to be that the handset looks to be faulty.

As I said, I restored the phone and then set it up as new last night. I didn't install any apps on it at all, and the only thing I did was make sure that the contacts had come down ok from the cloud, and configured one POP3 email account that she needed to use.

The phone was charged overnight, so started out this morning at 100%. My wife says she only used it for very limited use at lunchime, read some news stuff, and when she came home tonight it was still showing 99%. Seemed too good to be true.....

She then called our son a short time ago, and literally two minutes into the call the phone turned off. Completely dead. Not even the plug in to charge / low battery warning when you pressed the power button.

Ive now charged it suffciently to power it back on again. If I look at the battery usage, it's saying that in the last 20 hours, 'News' has used 50% of the battery (8 minutes), 'Safari' has used 26% (6 minutes), and 'Home & Lock Screen' has used 15% (19 minutes). Messages, Weather and Mail have claimed the other few % with a few minutes each.

Basically, adding it up, a full charge has given 37 minues of 'On screen' time and it's dead.

I think a trip to the Genius Bar is definately on the horizon. :(
 
Well, I can confirm the handset was indeed faulty, and was duly replaced at the Apple store yesterday.

I'm kicking myself for not actually taking it out of it's case fully when restoring it etc., as when the genius took it out of the case the battery had swollen up and split/separated the case.

Still all sorted out now, so all's well that ends well.
 
bigscotal said:
Well, I can confirm the handset was indeed faulty, and was duly replaced at the Apple store yesterday.

I'm kicking myself for not actually taking it out of it's case fully when restoring it etc., as when the genius took it out of the case the battery had swollen up and split/separated the case.

Still all sorted out now, so all's well that ends well.
Click to expand...


Did they run a test on your phone to check?
 
1rottenapple said:
Did they run a test on your phone to check?
Click to expand...

I wasn’t there myself, so not 100% sure on the exact details.

What I can say is that the night before it was taken in to the store, I tried to charge it so my wife could at least reset it to factory settings and make sure there were no personal details etc left on it.

Despite being plugged in for a couple of hours, it wouldn’t turn on at all. Nothing, completely and utterly dead.

With that in mind, I doubt the genius in store would have been able to do much in the way of diagnostic testing on it.
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back