Recent reports indicate that the iPhone 18 Pro Max will come equipped with a battery capacity of 5,567 mAh, marking it as the largest battery ever in an iPhone model. This information has been sourced from a certification document by China's C3 quality inspection agency, as highlighted by tech outlets such as Apple Insider and the popular Weibo account, Digital Chat Station.

Initially, expectations suggested only a slight increase in battery capacity for the iPhone 18 series. However, the latest data reveals a significant leap for the premium model. Specifically, the U.S. version of the iPhone 18 Pro Max, which utilizes eSIM technology, will feature a 5,567 mAh battery, while the version with a physical SIM card will have a capacity of 5,391 mAh. This represents an increase of nearly 10% compared to the iPhone 17 Pro Max, which had battery capacities of 5,088 mAh and 4,823 mAh, respectively.

The difference in battery capacity between the U.S. and Chinese versions is attributed to hardware structure. Since the iPhone 14 generation, Apple has completely eliminated the physical SIM card tray in devices sold in the U.S., opting instead for eSIM technology. This change has allowed Apple to free up substantial internal space, enabling a larger battery size.

In addition to the increased battery capacity, the iPhone 18 Pro Max is expected to feature the new A20 Pro chip, manufactured using a 2 nm process that enhances energy efficiency. This combination is anticipated to make the iPhone 18 Pro Max the model with the best battery life in Apple's history.

Conversely, the iPhone 18 Pro will see only a modest upgrade, with a battery capacity of 4,288 mAh for the U.S. version and 4,056 mAh for the physical SIM version, which is a slight increase from the previous generation's 4,252 mAh and 3,988 mAh.

In addition to the Pro line, supply chain sources have hinted at significant upgrades for the iPhone Air 2, expected to launch in spring 2027. The battery capacity for this lightweight model will reportedly increase from 3,149 mAh to 3,500 mAh, addressing previous concerns regarding battery life.

With the larger battery and a dual-camera setup in a super-slim body, Apple is anticipated to implement a new OLED display technology from Samsung called CoE. This technology allows for a significantly thinner screen panel, creating enough space for a larger battery without increasing the overall thickness of the new iPhone Air.

The launch event for the iPhone 18 Pro, 18 Pro Max, and the foldable iPhone Ultra is expected to take place in early September. Meanwhile, models such as the iPhone 18, iPhone 18e, and iPhone Air 2 may not debut until the first half of 2027.