iPhone 18 Pro Max Battery Leak: Apple May Use Its Biggest iPhone Battery Yet with 5,425mAh Capacity

The latest leak suggests Apple may finally cross the 5,000mAh battery mark with the iPhone 18 Pro Max.

Reports claim the eSIM-only version could pack a 5,425mAh battery, while the physical SIM version may feature a 5,235mAh unit.

This would be a major upgrade compared with previous Pro Max models.

The larger 5,425mAh battery is expected for eSIM-only markets because removing the physical SIM tray creates more internal space.

Markets that still use a physical nano-SIM slot may receive a slightly smaller 5,235mAh battery.

India is likely to receive the physical SIM version, so buyers may not get the highest leaked capacity.

The iPhone 18 Pro Max is expected to use Apple's A20 Pro chipset.

Leaks suggest the chip could be manufactured on a 2nm process, which may improve power efficiency.

A larger battery combined with a more efficient processor could make the iPhone 18 Pro Max one of Apple's longest-lasting phones.

A bigger battery could help users who record 4K or 8K videos, play games, use hotspot, travel frequently or rely heavily on 5G.

It may also support Apple Intelligence features better by giving the phone more endurance during AI-heavy tasks.

• Longer screen-on time
• Better gaming sessions
• Improved camera recording endurance
• Longer 5G usage
• Better travel battery life
• More reliable full-day usage

A 5,425mAh battery would put the iPhone 18 Pro Max closer to premium Android flagships.

However, some Chinese Android brands already offer 7,000mAh or larger silicon-carbon batteries.

Apple may still depend on chip efficiency, iOS optimization and thermal control rather than only battery size.

Indian iPhones usually support physical SIM along with eSIM.

Because of this, the Indian iPhone 18 Pro Max variant may get the 5,235mAh battery instead of the larger 5,425mAh eSIM-only battery.

Even then, it would still be a major battery upgrade compared with older Pro Max models.

Apple is expected to launch the iPhone 18 series in September 2026.

The lineup may include iPhone 18, iPhone 18 Pro, iPhone 18 Pro Max and other model variations depending on Apple's final strategy.

If battery life is your biggest priority and you already own an older iPhone, waiting for the iPhone 18 Pro Max could make sense.

But if you need a phone immediately, the iPhone 17 Pro Max, iPhone Air and current iPhone models may still offer excellent performance and better discounts.

The iPhone 18 Pro Max battery leak suggests Apple may finally deliver a major battery capacity jump.

If the 5,425mAh eSIM figure is accurate, this could become the longest-lasting iPhone ever.

For Godealio readers, this is a key Apple story to watch before buying a premium iPhone in 2026.