Apple has released the second iOS 11.3 public beta. The public beta is available on Apple's Beta Software Program website. Just remember that beta software, so proceed with care.
The iOS 11.3 public beta sports a "Battery Health" feature that provides info on your iPhone’s battery. There’s also four new Animoji for the iPhone X and new features such as Messages on iCloud for storing your iMessages in iCloud, and ARKit 1.5.
Apple does public betas in order to increase the size of the pool of testers. The tech giant recommends keeping back-ups of your files before installing a public beta.