Apple has made a new beta version of iOS 11.3 available to developers.
iOS 11.3 Beta 3 tweaks performance and includes the battery health meter for certain devices. The tool is meant to help people balance battery life and speed/performance of older iPhones.
The public version of iOS 11.3 will likely be released later this week. Apple said the final version of iOS 11.3 will be available to all consumers this spring. Earlier this week, the company released iOS 11.2.6 to resolve several bugs.