Apple's OLED iPhone to fit a 2,700 mAh battery while being around the same size as the iPhone 7 - GSMArena.com news
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Amazon.com: FLSTOR Battery for iPhone X 5000mah, High Capacity Replacement Battery Kit for iPhone X Model A1865, A1901, A1902 0-Cycle Spare Battery with Professional Repair Tools Kit, Installation Guidance : Cell Phones