Overview
- Chinese 3C/C3 certification screenshots posted by tipsters and reported by multiple outlets list iPhone 18 Pro capacities as 4,056mAh (China) and 4,288mAh (U.S.) and Pro Max capacities as 5,391mAh (China) and 5,567mAh (U.S.).
- The Pro Max's U.S. figure is roughly 9–10% higher than the iPhone 17 Pro Max and represents a much larger year‑over‑year jump than the modest change shown for the smaller Pro.
- Reports say the U.S. variants can use slightly larger cells because Apple has used eSIM‑only designs there since the iPhone 14, freeing space previously taken by a physical SIM tray.
- Analysts and coverage link the larger cell to higher power needs from a rumored A20 chip built on a 2nm process and expanded on‑device AI tasks, and leaks also suggest a thicker chassis and bigger camera module to fit the battery.
- The capacity numbers come from third‑party screenshots and supply‑chain documents and remain unverified by Apple ahead of the company’s expected September unveiling, so they should be treated as reported leaks rather than confirmed specs.