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Leak Tips iPhone 18 Pro Max to Be Thicker and the Heaviest iPhone Yet

A Weibo post links the weight gain to a larger battery with a stainless‑steel vapor chamber, with all details unverified before an expected 2026 launch.

Overview

  • Weibo leaker Instant Digital claims the iPhone 18 Pro Max will top 240 grams, about 10 grams more than the 233‑gram iPhone 17 Pro Max, for an estimated weight near 243 grams.
  • The display size is expected to stay at 6.9 inches, with the added heft attributed to internal changes rather than a larger form factor.
  • The thicker build is linked to a bigger battery and a new vapor‑chamber cooling design using stainless steel, according to the leak.
  • Rumored camera updates include a Main camera with variable aperture and a new three‑layer stacked image sensor developed by Samsung, with potential tweaks to Dynamic Island and Face ID.
  • MacRumors notes the source has a mixed record for accuracy, and the iPhone 18 Pro lineup is still slated for a fall 2026 debut.