Following user complaints, Apple confirmed that iOS 5 had poor battery life for some iPhone 4s4S users and stated that it will be fixed in the upcoming software update.<ref name="Engadget iOS 5 battery bug">{{cite web|url=https://www.engadget.com/2011/11/02/apple-confirms-ios-5-bugs-causing-battery-drain-promises-a-fix|title=Apple confirms iOS 5 bugs causing battery drain, promises a fix 'in a few weeks'|date=November 2, 2011|website=Engadget|access-date=January 17, 2012|archive-date=January 7, 2012|archive-url=https://web.archive.org/web/20120107105142/http://www.engadget.com/2011/11/02/apple-confirms-ios-5-bugs-causing-battery-drain-promises-a-fix/|url-status=live}}</ref> The iOS 5.0.1 fixed bugs related to battery drain issues.<ref name="Engadget iOS 5 battery improvement">{{cite web|url=https://www.engadget.com/2011/11/11/poll-have-you-noticed-battery-improvements-after-updating-to-io|title=Poll: Have you noticed battery improvements after updating to iOS 5.0.1?|date=November 11, 2011|website=Engadget|access-date=January 8, 2012|archive-date=January 7, 2012|archive-url=https://web.archive.org/web/20120107140530/http://www.engadget.com/2011/11/11/poll-have-you-noticed-battery-improvements-after-updating-to-io|url-status=live}}</ref>
