Apple iPhone XS Smart Battery Case (Black) MRXK2LL/A B&H Photo
Smart Battery Case Replacement Program for iPhone XS, iPhone XS Max, and iPhone XR - Apple Support
iPhone X / XR用 Smart Battery Case 純正 golf-gakkai.jp
Amazon.com: Feob Battery Case for iPhone Xs/X, Rechargeable 6500mAh Portable Charging Case Extended Battery Pack Cover Power Bank Charger Case for iPhone Xs/X[5.8 inch]-Black : Cell Phones & Accessories
Apple's new Smart Battery Case fits an iPhone X, but charging requires iOS 12.1.3