iOS 11.3: How to use Apple's iPhone Battery Health tool
In response to public demand, iOS 11.3 introduces a new battery management system that puts users back in control of their iPhone.
Background noise
Apple faced fury (and multiple lawsuits) when it was revealed that the company has been throttling device performance on older devices.
Apple said this was to prevent unexpected shut downs as the batteries inside its products inevitably fade. However, many of even Apple’s most loyal users felt this built-in obsolescence was a step too far from the firm.