Apple has released today a Smart Battery Case for the new generation of iPhones. The three XS, XS Max, and XR cases have undetermined battery sizes which I am sure will be seen in future tear downs. The battery cases also support Qi charging and other Apple Lightening accessories.
On average it seems they take the talk time up to 34-37 hours of battery life. All three come in black or white with the same soft touch feel as the silicone cases. The lock screen will show the current charge for iPhone and case.
All three can be purchased below and arrive January 18th for $128.