Apple is about to fundamentally rethink how it powers its flagship smartphone. After years of relying on a single internal power source, the company appears ready to embrace a dual-battery configuration for its upcoming "iPhone Ultra."

The smoking gun lies within iOS 27 beta 4. Newly surfaced code references explicitly point to multi-battery diagnostics, moving this massive hardware shift from a mere rumor to a near certainty.

A First for the iPhone

Foldable Android phones have used dual-battery systems for years to balance weight and optimize limited internal space. However, this would mark uncharted territory for Apple's traditional iPhone lineup.

Why make the jump? Splitting the power into a dual-cell configuration dramatically improves thermal management. It also paves the way for significantly faster charging speeds without dangerously overheating the device.

Battery Capacities and Expectations

A recent regulatory filing revealed the exact capacities of this unprecedented hardware setup. Apple plans to pair a 1,921mAh cell with a larger 2,962mAh unit.

Combined, this dual-cell design delivers a total capacity of 4,883mAh.

Previous iOS 27 beta releases have already teased massive form-factor changes, hinting at multiple displays and even a foldable iPhone. We'll see exactly how Apple pitches this multi-battery approach when the iPhone Ultra debuts in early September.