Apple hasn’t officially unveiled the iPhone 18 Pro lineup yet, but new leak reports have surfaced with detailed battery capacities for both the iPhone 18 Pro and iPhone 18 Pro Max. If the figures are accurate, both models will see battery size increases compared to their iPhone 17 Pro counterparts-with notable differences between US and Chinese versions. The largest boost is expected on the iPhone 18 Pro Max.
The leak suggests the Chinese variant of the iPhone 18 Pro will pack a 4056 mAh battery, up from the iPhone 17 Pro’s 3988 mAh. The US model reportedly increases to 4288 mAh from 4252 mAh. These gains are moderate and fit Apple’s usual approach: improving battery life not just by bigger cells, but also through chipset efficiency, display tweaks, and modem upgrades.
The iPhone 18 Pro Max shows a more substantial jump. The Chinese model’s battery reportedly rises to 5391 mAh from last year’s 4823 mAh, while the US version grows to 5567 mAh from 5088 mAh-a roughly 12% and 9% increase, respectively. Should these numbers hold up, the Pro Max will continue to be the longest-lasting iPhone in Apple’s lineup, as it has been in recent years.
- iPhone 18 Pro China: 4056 mAh
- iPhone 18 Pro US: 4288 mAh
- iPhone 18 Pro Max China: 5391 mAh
- iPhone 18 Pro Max US: 5567 mAh
These regional differences aren’t new: Apple has long shipped iPhones with varying radio modules, eSIM support, and physical SIM configurations depending on the market. Certification filings have also revealed differing nominal battery capacities. More important is that Apple rarely highlights milliamp-hour ratings in presentations, instead focusing on real-world battery life measured in hours. Final assessments of how these battery increases affect endurance won’t be possible until independent testing after launch.
By global premium smartphone standards, these batteries aren’t huge. Many Android flagships in 2025 and 2026 are equipped with 5,500 to 6,000 mAh batteries, and some Chinese brands have pushed upwards of 6,500 mAh thanks to silicon-carbon battery cells. Apple prefers to optimize power consumption to balance performance and longevity rather than simply chasing bigger numbers-so even a modest bump in battery capacity on the Pro models could translate into noticeable improvements in everyday use.
Additional leaks have already sparked interest in the iPhone 18 Pro series, including photos of the iPhone 18 Pro Max batteries from different regions and details about the internal circuitry of the new phones. As we get closer to Apple’s expected September launch event, more clarity will emerge on how these battery upgrades translate into screen-on time, especially once the specs of the new chip and displays are confirmed.