In 2018, a replacement battery for an iPhone 6 (or later model) that is no longer under warranty will cost $29 instead of $79 and a software update will allow iPhone users to see if the condition of the battery is affecting the phone's performance. And Apple didn't mean any harm by deliberating slowing older-model phones -- honest! They said so.
Apple apologizes for slowed-down iPhones and offers cheaper battery replacement
http://www.latimes.com/business/tech...228-story.html