A fresh leak surrounding Apple’s iPhone 18 Pro Max is shifting attention back to battery life, raising questions about whether Samsung’s upcoming Galaxy S26 Ultra may be falling behind in real-world endurance.

According to well-known tipster Digital Chat Station, the iPhone 18 Pro Max will feature a larger battery than its predecessor, the iPhone 17 Pro Max. The Chinese variant is expected to come with a 5,000 mAh battery, while international models could receive an even larger capacity.

Early information suggests that iPhone 18 Pro Max models sold outside China could feature a battery between 5,100 and 5,200 mAh. The final size may depend on whether the device includes a physical SIM slot or supports eSIM only.

Why SIM variants matter for battery size

Apple already uses different battery capacities across regions. The iPhone 17 Pro Max includes a 4,823 mAh battery on models with a physical SIM slot, while eSIM-only versions pack a 5,088 mAh battery.

Following this pattern, the iPhone 18 Pro Max could once again ship with slightly different battery sizes, depending on hardware configurations and regional requirements.

Paper specs vs real-world performance

While a 5,100 mAh battery may not sound impressive next to Android flagships offering 6,000 to 7,000 mAh cells, Apple’s phones often outperform rivals in daily use. The iPhone 17 Pro Max is already considered one of the longest-lasting smartphones on a single charge.

This endurance is largely credited to Apple’s tight hardware-software integration and aggressive power optimization within iOS.

Galaxy S26 Ultra starts to look vulnerable

Leaks suggest Samsung’s Galaxy S26 Ultra will retain a 5,000 mAh battery, the same capacity used since the Galaxy S20 Ultra launched six years ago. It is also expected to run the Snapdragon 8 Elite Gen 5, built on a 3nm process.

In comparison, the iPhone 18 Pro Max is rumored to feature Apple’s A20 Pro chip, potentially based on a more efficient 2nm process. Combined with a larger battery and iOS optimization, this could allow Apple’s flagship to deliver longer screen-on time than Samsung’s next Ultra model.

Bigger picture for 2026 flagships

If these leaks prove accurate, the iPhone 18 Pro Max may not only challenge the Galaxy S26 Ultra but also compete strongly against Android flagships of 2026 with much larger batteries.

The leak reinforces a growing narrative in the smartphone industry: battery efficiency matters more than sheer capacity, and Apple may be positioning itself to win that fight once again.