Hi everyone.
I am usually quite suspicious when I see battery life issues threads pop at every new ios version.
Although this time, I have to say the battery life loss is dramatic for me.
I have an iphone 7+, had zero problem lasting the day before, but since I put ios11 I have to charge another time everyday. It seems that battery is draining super fast when I am using it, even for a simple thing like whatsapp.
I tried to DFU restore and start from scratch, it seems it didn't help.
Although, there is one "what-may-be-a-good-news"
I was on the phone with Apple Care for something else, and asked the advisor to make a battery check remotely, which he did and found out my battery is fine - but he said it's probably coming from ios11, as they had lots of complaints from clients with battery life problems, and it will probably be solved with a software update.
So, wait and see.