Since i buy mi iphone 6s my battery goes down fast, what can i do?
I Buy it from the apple store can i go and they will fix it for free?
If Wifi Assist is turned on, this can drain your battery quickly. To turn it off, go to Settings> Mobile Data> Scroll to the very bottom of the screen and switch off Wifi Assist. This should help.
There probably isn't anything to fix. Your best bet is to go to an Apple store first thing in the morning and before they get busy. Then find an ssistant with particular knowledge of phones and ask him/her what you should do to prevent too quick a drain on your battery. And take notes.
I found tuning off apps refresh makes battery last 2/3 hours more .
Battery should last a full day if not go to apple store .