Regulatory Filings Reveal iPhone 18 Pro Battery at 3,988 mAh, Pro Max at 5,080 mAh

Battery hardware details for Apple's latest flagship smartphones, the iPhone 18 Pro and iPhone 18 Pro Max, have been published through regulatory compliance certification documents. Following the fall product launch event, official archived filings from telecommunications regulatory databases and environmental compliance certification bodies listed the exact battery capacity parameters for the two Pro-series flagships. Apple did not directly state rated capacity in milliampere-hours in its public keynote or official technical specifications pages, instead using equivalent scenarios such as continuous video playback time. The regulatory filings disclosed the specific engineering data.

The iPhone 18 Pro's lithium-ion battery has a rated capacity of 3,988 mAh and a rated energy of approximately 15.52 Wh; the iPhone 18 Pro Max's battery has a rated capacity of 5,080 mAh and a rated energy of approximately 19.78 Wh. Compared with the previous generation, the iPhone 18 Pro's battery capacity is about 11% higher than the iPhone 17 Pro's approximately 3,582 mAh, while the iPhone 18 Pro Max is about 8.4% higher than the iPhone 17 Pro Max's approximately 4,685 mAh. This is also the first time battery capacity in Apple's phone lineup has officially crossed 5,000 mAh.

Teardown and certification materials indicate that Apple has continued and upgraded its high-energy-density steel-shell/aluminum metal-casing cell packaging technology on the iPhone 18 Pro series. This metal casing provides physical torsional rigidity to comply with repairability regulations and improves heat conduction efficiency during sustained high-power fast charging and prolonged high-load graphics or AI computing. Body heat is dissipated outward through graphite thermal pads and the internal cooling architecture, creating net internal space to accommodate a larger volume of electrode active material.

Combined with energy-efficiency optimizations from the A20 Pro chip built on TSMC's latest advanced process and deep-sleep algorithms at the iOS 27 system level for scheduling the dynamic refresh rate ProMotion display and on-device neural compute, Apple previously announced at its launch event that the iPhone 18 Pro offers up to 30 hours of offline video playback on a single charge, while the iPhone 18 Pro Max offers up to 35 hours. The above battery capacity and rated energy figures come from regulatory filings, while the video playback time figures come from Apple's official launch event.