Apple’s next Pro models are already drawing attention for one reason that matters to many buyers: battery capacity. A filing in China’s 3C database has now surfaced details that point to larger batteries for the iPhone 18 Pro and iPhone 18 Pro Max, with the biggest increase reserved for the larger model.
The timing is notable because the information appeared about two months before the expected September launch window for the new iPhone lineup. The leak, shared by Digital Chat Station in a Weibo screenshot, outlines four battery sizes across the iPhone 18 Pro family and suggests Apple is still splitting capacities by region and network configuration.
Small gains for iPhone 18 Pro, larger changes for Pro Max
For the iPhone 18 Pro, the China model that is also likely to be the international version with a physical SIM slot is said to carry a 4,056 mAh battery. That is only slightly higher than the 3,988 mAh cell used in the iPhone 17 Pro, a rise of about 1.71 percent.
The U.S. eSIM-only version is also expected to get a small bump. Its capacity is listed at 4,288 mAh, up from 4,252 mAh on the previous model, which translates to roughly 0.85 percent.
This split highlights a long-running Apple pattern. Battery capacities can differ between markets even when the model name stays the same, with Apple continuing to manage physical SIM and eSIM-only variants separately.
| Model | Current Capacity | Previous Model | Change |
|---|---|---|---|
| iPhone 18 Pro China / International SIM | 4,056 mAh | 3,988 mAh | +1.71% |
| iPhone 18 Pro U.S. eSIM-only | 4,288 mAh | 4,252 mAh | +0.85% |
| iPhone 18 Pro Max China / International SIM | 5,391 mAh | 4,823 mAh | +11.78% |
| iPhone 18 Pro Max U.S. eSIM-only | 5,567 mAh | 5,088 mAh | +9.41% |
Pro Max gets the biggest jump
The iPhone 18 Pro Max appears to be where Apple is making the clearest battery push. The China version with a SIM slot is said to use a 5,391 mAh battery, a sharp increase from the 4,823 mAh battery in the iPhone 17 Pro Max.
That 11.78 percent jump stands out as the most significant change in the lineup so far. For users who prioritize longer endurance, the bigger model could end up being the more interesting upgrade even before other hardware changes are known.
The U.S. version without a SIM slot is reportedly even larger. It is said to reach 5,567 mAh, up from 5,088 mAh on last year’s model, marking a 9.41 percent increase.
Why the 3C filing matters
Apple does not officially list battery capacity in its product pages. The company usually focuses on estimated usage time instead, which means exact mAh numbers often emerge only from regulator documents or post-launch teardowns.
That makes the 3C database entry an important clue for what may ship in the final device. While it is not a public announcement from Apple, regulatory data often provides a strong early indication of component choices ahead of launch.
The numbers also suggest that Apple is prioritizing efficiency and endurance more aggressively on the Pro Max tier than on the standard Pro model. The smaller Pro sees only modest growth, while the larger model gets a far more visible capacity boost.
For buyers watching the next iPhone cycle closely, the leak offers a simple signal: the iPhone 18 Pro Max may be the model to watch if battery life is the main concern. The final confirmation will only come once the devices are launched and, eventually, opened up after release.
