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Correction: iPhone XS and XS Max Smart Battery Cases Have Larger Capacity Than Previous Versions - MacRumors
Apple Hub on X: "Full specs including battery capacity and RAM inside the new iPhones have surfaced in regulatory filings. The iPhone XS and XS Max both feature 4GB of RAM, XR
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iPhone XS and XS Max Have 4GB of RAM, XR Has 3GB; XS Max and XR Have Larger 3,174 and 2,942 mAH Batteries - MacRumors
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iFixit: iPhone XS Has 'Notched' Battery and iPhone XS Max Has Apple-Designed Power Management Chip [Updated] - MacRumors
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iPhone XS and XS Max Have 4GB of RAM, XR Has 3GB; XS Max and XR Have Larger 3,174 and 2,942 mAH Batteries - MacRumors
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