iFixit has published a teardown of the iPhone 18 Pro and iPhone 18 Pro Max, providing a closer look at the internal hardware behind Apple’s latest Pro models. The examination confirms battery capacities for eSIM-only versions and explores the new variable aperture camera system, an enlarged vapor chamber, and changes that could make some repairs more difficult.

The teardown is available as both a written report and a video. While the devices introduce several internal changes, iFixit also identified a potential durability concern involving the display assembly and said more testing is needed before drawing firm conclusions.

iPhone 18 Pro battery capacities confirmed

According to iFixit’s measurements, the eSIM-only iPhone 18 Pro contains a 4,288 mAh battery. That is a modest increase from the 4,252 mAh capacity reported for the iPhone 17 Pro, representing a gain of 0.8%.

The iPhone 18 Pro Max shows a more substantial change. Its battery has a capacity of 5,567 mAh, compared with 5,088 mAh in the iPhone 17 Pro Max. That amounts to an increase of 9.4%.

These capacities apply to eSIM-only versions sold in the United States, Canada, Mexico, Japan, Saudi Arabia, the United Arab Emirates, Qatar, Oman, Bahrain, and Kuwait. iPhone 18 Pro models sold in other countries include a physical SIM card tray, and battery capacities for those versions had surfaced previously.

Teardown examines camera and cooling changes

One of the main features examined inside both phones is the new variable aperture system. The teardown provides a closer view of how the mechanism is integrated into the devices, although the report does not establish additional specifications beyond its presence in the iPhone 18 Pro and iPhone 18 Pro Max.

iFixit also found a larger vapor chamber designed to help manage heat. The change could support thermal control during demanding tasks, but the teardown itself does not provide performance measurements showing how much the larger component improves cooling.

Storage repairs may be less convenient

Apple has placed the NAND storage inside the iPhone 18 Pro’s dual-layer logic board, according to iFixit. Because of that layout, storage-related repairs may be less convenient than on designs with more accessible components.

The teardown also found an unexpected issue with the screen’s plastic frame. The frame cracked or broke away on three of the four iPhone 18 Pro models that iFixit opened. iFixit said this was not an issue it encountered with previous models, but emphasized that additional testing is necessary.

The findings give repair specialists and owners an early view of the iPhone 18 Pro’s internal design. The battery gains are particularly notable on the Pro Max, while the logic-board layout and possible screen-frame weakness could influence future repair assessments.