Apple's new Smart Battery Case fits an iPhone X, but charging requires iOS 12.1.3
Apple Smart Battery Case for iPhone XS
Apple iPhone X Battery Case - 5000 MAH Power Bank – punkcase
Smart Battery Case for iPhone XS Appears to Be Compatible With iPhone X - MacRumors
Apple's new Smart Battery Cases sport larger capacity than previous versions
Apple's new Smart Battery Case fits an iPhone X, but charging requires iOS 12.1.3
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Exclusive: First look at unreleased Apple Smart Battery Case for iPhone XS, three models and 2018 release possible - 9to5Mac
Best Buy: Apple iPhone XS Smart Battery Case Black MRXK2LL/A
Amazon.com: Battery Case for iPhone X XS 10, 4100mAh Slim Charging Case Protective Rechargeable Charger Case Compatible with iPhone X XS 10 (5.8 inch) - Black [New Version] : Cell Phones & Accessories
Smart Battery Case Replacement Program for iPhone XS, iPhone XS Max, and iPhone XR - Apple Support
Apple's Smart Battery Case for the iPhone XS also works with the iPhone X - PhoneArena