Since iOS 10.2.1, Apple has instituted a policy of employing "performance management" techniques (including CPU throttling) on iPhone devices whose batteries are degraded, in order to maintain device stability and prolong their lifespan. These changes came in the wake of reported issues with unexpected shutdowns on certain iPhone models following the release of iOS 10.1.1. In response to criticism over the practice, including concerns over this being a form of planned obsolescence, Apple announced that it would offer discounted battery replacements for iPhone 6 and newer in 2018, and that it would add additional battery health information on a future version of iOS (iOS 11.3, which also allows users to disable this throttling).