About the battery and performance of iPhone 11 and later - Apple Support
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Amazon.com: WUHAO Battery for iPhone 11,4000mAh Upgraded Capacity for iPhone 11 A2111 A2221 A2223 Replacement Battery with Screws and Professional Repair Tool Kit : Tools & Home Improvement
Performance & battery life : Apple iPhone 11 and iPhone 11 Pro review: Advancing the state of the iPhone (Updated!) - HardwareZone.com.sg