Most people probably aren’t aware that Apple’s iPhones aren’t identical worldwide. In countries like China, where the company still offers a physical SIM card slot, the battery layout can differ slightly from that of the version sold in the U.S.
The latest information indicates Apple plans to maintain this distinction with the iPhone 18 Pro. The U.S. version is reportedly testing at around 4,288 mAh, while the Chinese model comes in at closer to 4,056 mAh.
That gap exists because American iPhones dropped the physical SIM tray back with the iPhone 14. Without that small slot carved into the chassis, Apple can fit a physically larger battery cell inside.
Compared to the iPhone 17 Pro, these numbers represent pretty modest movement. The U.S. model delivers roughly 36 mAh, while the Chinese version delivers about 68 mAh. On paper, neither figure is going to make anyone put down their charger. But raw capacity is only part of the story.
The iPhone 18 Pro is also expected to run on Apple’s A20 Pro chip, built on TSMC’s 2nm process. A more efficient chip pulling less power per task can extend battery life even when the physical cell barely grows.
Apple’s rumored C2 modem, also expected in this lineup, could chip in further savings on the radio side, which historically chews through a surprising amount of juice.
If the standard Pro feels like a small step, the Pro Max is shaping up to be something else.
Current expectations point to the iPhone 18 Pro Max reaching the 5,000 mAh mark, while versions sold outside the U.S. could reach between 5,100 and 5,200 mAh. That would be a genuinely significant jump for Apple’s largest phone.
It’s still too early to know whether these numbers will hold up, so it’s worth keeping some skepticism until more details emerge.
