iPhone 6 Battery Replacement Program
Late last year Apple released a message to iPhone users about batteries and performance. In case you missed it, here's what it said.
Essentially it boils down to batteries underperforming on older phones like the iPhone 6 and iPhone 6 Plus leading to unexpected shutdown issues.
In response, Apple pushed out a software update to improve power management during peak workloads and help the iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, and iPhone SE avoid unexpected shutdowns. The company then extended the same support to the iPhone 7 and iPhone 7 Plus.
After the release of these updates the company received complaints from iPhone users who were experiencing slower performance in some situations. The company went back to the drawing board and discovered the issue was in fact due to "chemical aging of the batteries in older iPhone 6 and iPhone 6s devices."
To address these concerns Apple reduced the price of an out-of-warranty iPhone battery replacement by $50 (from $79 to $29) for anyone with an iPhone 6 or later whose battery needs to be replaced.
This service is available worldwide through December 2018 and details can be found on Apple's website.