iPhone 18 Pro Battery Specs Confirmed in Regulatory Filings Ahead of September Launch

The iPhone 18 Pro and iPhone 18 Pro Max will carry larger batteries than their predecessors, according to documents filed with China's certification authority and reported by Forbes. Apple does not name the models in the paperwork, but the capacities and timing line up with supply-chain reporting and the expected September release window, giving buyers the clearest look yet at what the next Pro phones pack inside.

The battery numbers in the filings
Two capacities are listed for the iPhone 18 Pro: 4,065 mAh for the Chinese model and 4,288 mAh for the US-bound version, small gains of 77 mAh and 36 mAh over the iPhone 17 Pro. The iPhone 18 Pro Max sees a much bigger jump, rising 568 mAh to 5,391 mAh in China and 479 mAh to 5,567 mAh in the US.

Why US models get more capacity
US iPhones ship as eSIM-only devices, which frees internal space that Apple fills with extra battery. Chinese models keep a physical SIM tray, so their cells come in slightly smaller. Differences in regional testing methods and normal component variance also account for small gaps between the listed figures.

Bigger cells, not longer battery life
The added capacity is not expected to mean more hours on a charge. Reporting around the filings points to the A20 chipset's on-device AI workload as the main consumer of the extra power, with Apple Intelligence and Siri running heavier background tasks in iOS 27. Apple has historically directed capacity gains toward more performance headroom rather than longer screen-on time.

The battery chemistry Apple is skipping
The figures suggest Apple is staying with lithium-ion polymer cells rather than moving to silicon-carbon technology. Android makers such as Oppo and Honor use silicon-carbon packs to fit far more capacity into the same volume in their 2026 flagships. Samsung has likewise stayed with the older, better-understood chemistry across its lineup, and Apple appears to be on the same cautious path.

A September launch window
Apple is expected to follow its usual autumn schedule, with the iPhone 18 Pro and iPhone 18 Pro Max reaching stores in September 2026 alongside the company's first foldable. Pricing does not appear in any regulatory paperwork, so no figure can be treated as reliable yet.

What this means for buyers
The takeaway is simple: the next Pro iPhones should hold steady on endurance while running noticeably heavier AI features. Anyone holding an iPhone 16 Pro or older gets a meaningful battery bump either way, particularly on the Pro Max, where the capacity gain approaches twelve percent.

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