Multiple reports say leaked information points to different iPhone 18 Pro Max battery capacities depending on whether the model uses an eSIM or a physical SIM tray. Several outlets, citing leak posts and reporting from GSMArena and others, repeat the same core figures: a 5,235 mAh battery for the physical SIM (“Nano SIM”) version and a 5,425 mAh battery for the eSIM-only version. Other coverage also describes the change as an increase over the iPhone 17 Pro Max, which has been reported at 4,823 mAh (Nano SIM) and 5,088 mAh (eSIM).
However, not all details match. One report, based on China’s 3C regulatory database filings, says the eSIM model may have a higher capacity than previously claimed (5,567 mAh) and the physical SIM version may differ as well, indicating that the exact numbers may vary by source or by how the filings are interpreted. Additional reporting also mentions expectations for the iPhone 18 series to launch in September 2026. Overall, the outlets agree that iPhone 18 Pro Max battery capacity data is emerging from leaks and regulatory references, but the precise mAh ratings are not uniformly confirmed.
