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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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Amazon.com: TAYUZH [5000 mAh] Battery for iPhone XR Upgraded High Capacity Li-Polymer Battery Replacement Compatible with iPhone XR (A1984, A2105, A2106, A2108) with Repair Tools Kit and Installation Manual : Cell Phones
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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