Due to reports of iPhones shutting off with around 30% battery life on the iPhone 6, iPhone 6s and iPhone SE , Apple released iOS 10.2.1 which secretly throttled the CPU performance of the iPhone 6, iPhone 6s and iPhone SE with older batteries. Other iPhone models are not affected by this problem and so have no need to be throttled.
While there had been anecdotal evidence that iPhones and other Apple products appeared to slow down just before a new launch, this was not taken seriously until hard data was posted on Reddit. In response Apple issued a short letter explaining the situation. On 28 December 2017 they announced that the cost of replacing an out of warranty battery would be reduced from $79 to $29.
- "Apple's apology for Batterygate didn't go far enough". usatoday.com.
- Balakrishnan, Josh Lipton, Anita (28 December 2017). "Apple apologizes for iPhone slowdowns and offers $29 battery replacements". cnbc.com.
- Tung, Liam. "iPhone throttling: Class actions pile up as Apple hit with 32nd lawsuit - ZDNet". zdnet.com.