iPhone 6s plus battery has gotten terrible in past month?
My iPhone 6s plus battery used to be amazing, since i got it last September it would last all day. I used to charge it at 7am and take it off charge at around 8am every morning and it would normally be at 100%, i would use 3g, music, apps all day and by 4pm it was only on 50-70%. Sometimes the battery wouldn't even go down when i listened to music. But in this last month it was gotten about as bad as my iPhone 5 battery was. The battery will go down so fast. I still leave it to charge till 100% and then listen to music but instead of the battery not going down at all it goes down 10-20%! Now by the time its 4pm my phone is either out of charge or on red. My phone also randomly turns off. Say if its on 15% it will turn off even though theres battery left, and wont turn on until i charge it again. I loved my 6s plus and one of the reasons i got it was for the amazing battery life. I would say i have been using it just the same as i did when the battery was good so i have no clue whats gone wrong. Can anyone help?
iPhone 6s Plus, iOS 9.3.1, null