https://www.theverge.com/circuitbreaker/2019/1/16/18185502/apple-smart-battery-case-iphone-xs-support-iphone-x

It looks like the new $129 Smart Battery Case for the iPhone XS will support last year’s flagship iPhone X after all.

Yesterday, it seemed like Apple was leaving its most dedicated customers out in the cold when the company announced the new battery case for the iPhone XS, XS Max, and XR but not for the iPhone X that early adopters snapped up in late 2017.