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iPhone 18 Pro Max Might Arrive With Apple's Biggest Smartphone Battery to Date, Latest Leak Suggests

iPhone 18 Pro Max Might Arrive With Apple's Biggest Smartphone Battery to Date, Latest Leak Suggests

Apple is widely expected to unveil the iPhone 18 lineup in September 2026.

Written by Sucharita Ganguly, Edited by David Delima | Updated: 3 July 2026 14:11 IST

iPhone 18 Pro Max Might Arrive With Apple's Biggest Smartphone Battery to Date, Latest Leak Suggests

iPhone 17 Pro Max with SIM support carries a 4,832mAh battery

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Highlights

iPhone 18 Pro Max eSIM model could pack a 5,425mAh battery
The iPhone 18 Pro is also tipped for a battery upgrade
Apple may use a 2nm A20 Pro chip in the new phones

Apple's iPhone 18 Pro Max may arrive with a significantly larger battery than its predecessor, if a new leak is accurate. The latest information indicates that battery capacity could vary between regional variants, with the eSIM-only model tipped to receive the biggest cell. An earlier leak also suggested modest increases in battery capacity for the iPhone 18 Pro. If the reported specifications are correct, the eSIM version of the iPhone 18 Pro Max would be the first iPhone to feature a battery capacity exceeding 5,400mAh.

Apple's iPhone 18 Pro Max Battery Capacity Leaked Ahead of Launch

A post shared on Weibo by Duoge Internet Technology (translated from Chinese) claims the iPhone 18 Pro Max will ship with a 5,425mAh battery in markets where Apple offers only eSIM support. In countries that continue to receive a physical nano-SIM tray, the handset is said to include a 5,235mAh battery instead. The report attributes the difference to the extra internal space made available by removing the SIM card slot.

Iphone 18 Pro Max Discussion

Apple testing improved cameras for iPhone 18 Pro models

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An earlier leak hinted at the expected battery capacities of the iPhone 18 Pro. The physical SIM version is tipped to pack a 4,056mAh battery, while the eSIM model could carry a slightly larger 4,288mAh unit.

iPhone 18 Pro Rear Design, New Colourway Spotted in Drop Test Video

For comparison, the iPhone 17 Pro reportedly features batteries rated at 3,998mAh and 4,252mAh in the physical SIM and eSIM variants, respectively. The iPhone 17 Pro Max is said to include a 4,823mAh battery in markets with a SIM tray and a 5,088mAh battery where it is sold as an eSIM-only device.

Based on the leaked capacities, the Pro Max appears set for a larger battery upgrade than the standard Pro model. The smartphone is also expected to debut with Apple's rumoured A20 Pro processor, which is believed to use a 2nm manufacturing process. A higher battery capacity combined with a more efficient chipset could improve battery endurance, though the final result will also depend on software tuning and display power consumption.

Samsung's Galaxy S26 Ultra currently offers a battery comparable in size to the iPhone 17 Pro Max, while rumours suggest the Galaxy S27 Ultra could increase capacity to 5,500mAh. Chinese flagship phones, including the Xiaomi 17 Pro Max, Oppo Find X9 Pro and OnePlus 15, already use batteries around the 7,500mAh mark, and recent industry reports indicate that some Android flagships may approach 9,000mAh capacities before the end of the year.

This is When Apple Could Launch the iPhone 18 Pro and iPhone 18 Pro Max

Apple is widely expected to unveil the iPhone 18 lineup in September 2026. Until the company officially announces the devices, the leaked battery specifications remain unverified.

iPhone 17 Pro

KEY SPECS
NEWS

Display 6.30-inch

Processor Apple A19 Pro

Front Camera 18-megapixel

Rear Camera 48-megapixel + 48-megapixel + 48-megapixel

RAM 12GB

Storage 256GB, 512GB, 1TB

OS iOS 26

Resolution 1206x2622 pixels

More Apple mobiles Apple mobiles price in India

iPhone 17 Pro Max

REVIEW
KEY SPECS
NEWS

Design
Display
Software
Performance
Battery Life
Camera
Value for Money

Good
The boldest redesign since the iPhone X
Bright and stunning display
A19 Pro under the hood guarantees excellent performance
Massive camera upgrade
Video quality gets a much-needed bump
Centre Stage camera at the front changes selfie game on iPhones forever
Improved charging speed

Bad
Aluminium body picks up scratches
Expensive
Heavier than the 16 Pro Max

Read detailed Apple iPhone 17 Pro Max review

Display 6.90-inch

Processor Apple A19 Pro

Front Camera 18-megapixel

Rear Camera 48-megapixel + 48-megapixel + 48-megapixel

RAM 12GB

Storage 256GB, 512GB, 1TB, 2TB

OS iOS 26

Resolution 1320x2868 pixels

More Apple mobiles Apple mobiles price in India

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Further reading: iPhone 18 Pro Max, iPhone 18 Pro, iPhone 18 Pro Series, iPhone 17 Pro Max, iPhone 17 Pro, iPhone, Apple

Sucharita Ganguly

Email Sucharita Ganguly

Sucharita is a writer with Gadgets 360 and is mostly found playing with her cat in her free time. She has previously worked at breaking news desks across organizations. Powered by coffee, The Beatles, Bowie, and her newfound love for BTS, she aims to work towards contributing to a better media environment for women and queer folk. More