This is my third post on this thread. Since downloading iOS 10.1.1, I have been experiencing the same problems as others on my iPhone 6 Plus, as well as on my older iPhone 5 now functioning as an iPod Touch. I contacted AppleCare, as I am still under warranty for another few weeks, on Jan 5 and explained the problem. The Apple representative was very pleasant, even admitting to having experienced the same problems, and suggested I consider resetting the machine. I elected not to do so.
But, alas, the problems continue. Just last night my iPhone 6 Plus started at 10 p.m, at 100% charge, gradually diminished (or, I should say, the indicator showed drainage but who knows what was actually happening to the battery) as I used it, although when I used it intensively for about 30 minutes the battery indicator, then at 83%, did not budge. I went to sleep in the early hours with the iPhone nearby and not plugged in and at 57%. But when I awoke at 7:45 a.m. the indicator was at 4%. I plugged in the iphone to my computer and the battery indicator immediately changed to 31%. I measured capacity on an iMac battery measuring app and it showed 64% or thereabouts. A few days ago that iMac battery app showed capacity at a meagre 45% whereas, when I started using it the capacity was at 95%.
I called AppleCare again. Interestingly, my previous case number had disappeared from their records. I discovered that myself searching for it a day or two ago. The representative was very nice. She did a battery diagnostic over the phone. It showed Good. I informed her of the iMac battery measuring app results and she said she had no statistics, only Good or Not Good. She set me up for a Genius Bar meeting next Monday.
But I am pessimistic about the outcome with the Genius Bar. Based on others' comments, since the battery, measured by Apple indicators, showed Good, they will likely refuse me a new battery. They will want to do a complete reset, which is a pain for the consumer and will likely establish nothing. The most recent Forbes article raises questions whether iOS 10.2.1 will have any effect.
This is a terrible situation and completely unsatisfying to me and other Apple customers. That this problem does not affect every Apple iPhone owner who has downloaded iOS 10.1.1 (and 10.2 which I downloaded hoping it would fix things but it didn't) means there are certain factors at play that don't affect everyone. That people who obtain a new battery seem to no longer have the problem suggests that very new batteries aren't affected. But this doesn't mean our older batteries are simply the cause, since things were fine before 10.1.1. And that Apple measures my battery as Good at the same time that the iMac battery app shows a capacity of 65% raises questions. That the battery indicator stays at 100% (on my iPhone 5) for an hour while I'm using the iphone intensely, or at 83% on my iPhone 6 Plus while I'm reading on it for 30 minutes, or even at 1% after it drops to that for an extended period of time, raises questions about battery versus indicator. That the indicator jumps back to 50% or 30% immediately upon plugging in the iPhone also raises mysterious questions. I'm no techie but surely the 10.1.1 (and 10.2) operating systems are a cause, if not the sole cause.
Fix it now, Apple. You are losing customer patience and loyalty. Thank you.