Still have my iPhone 6+ I use exclusively for movies and games, pretty much an iPad mini mini. It's still on iOS 10.3.3. Will Apply force me to upgrade to latest iOS (11 or so?) before they allow me to replace the battery? Or do you think they will do so without my knowledge when then find out during battery replacement? My battery wear level on this is 41.7%, so battery lifespan level is at 59.3%. Has anyone encountered this problem? I don't want to upgrade it to iOS 11 or greater as it is not needed for watching movies or playing games. I'm sure it may put a strain, regardless of what naysayers say. It runs smooth as butter except for some games, perhaps due to the battery life. Thanks in advance!!