Hi Evagorasc, Belisarius is right in his main argument: Batteries are consumables and degrade according to the way they are used.
However, he only focuses on that, he has obviously not felt the realisation of having upgraded to IOS 10 and his battery suddenly drains and goes bang.
Like we have, to us it is obvious, IOS 9 = fine, IOS 10 = dead.
The proof is that in an unheard of turn of events, Apple released in depth battery diagnostic tools in 10.2.
You just do not do that if there is not an issue with the IOS or the battery, even a fool can see this.
So, our case is proved, IOS 10 has affected batteries in an adverse way.
Whether Apple admit to anything is another matter.
The floodgates may well open and yes, you will get the freeloaders with their 4 year old well-used and knackered iPhone 5's asking for them to be replaced.
However, you will also get the honest owner, who looks after their phone, charges it properly and then suddenly after September 2016 it is rendered unusable.
I do not know how Apple would manage that if it came to it.
But what is completely inexcusable is Apple's lack of comment.
On this alone I am considering going Nokia (after all these years) if it turns out a good smartphone later in 2017.
[Edit: I think one of the reasons why less people are posting here is that, as I mentioned previously, Santa has brought them a new phone. If Apple issued new IOS releases in January it may well have been a different story.]
Adrian.