Ahead of its anticipated launch, the iPhone 18 Pro Max is rumored to feature a significantly bigger battery than previous models and competitor Samsung’s Galaxy S26 Ultra, with eSIM-only versions potentially boasting the largest capacity yet.
- iPhone 18 Pro Max may have up to 5,425mAh battery capacity
- eSIM-only models allow larger batteries by removing SIM tray
- Samsung Galaxy S26 Ultra battery is 5,000mAh for comparison
What happened
Leaked information shared on Weibo suggests the iPhone 18 Pro Max will offer different battery sizes depending on whether the device supports a physical SIM or is eSIM-only. Models with a SIM slot reportedly come with a 5,235mAh battery, while eSIM-only versions could feature a 5,425mAh battery. Both capacities are larger than the current Samsung Galaxy S26 Ultra’s 5,000mAh battery.
Apple typically emphasizes software and hardware optimization rather than large battery sizes, making this a significant change. The possibility of removing the SIM tray to increase battery size highlights Apple's evolving design priorities, aiming to boost endurance without drastically enlarging the phone’s physical dimensions.
Why it matters
Battery life remains a crucial factor in smartphone user experience, and larger capacity batteries generally signal longer usage between charges. By increasing battery size, especially in markets favoring eSIM-only models, Apple could enhance the iPhone 18 Pro Max’s market competitiveness against flagship Samsung models that prioritize large batteries.
This move may also indicate Apple's growing confidence in transitioning to eSIM technology globally, eliminating the need for physical SIM trays. Additionally, combined with the expected A20 Pro chip, which promises efficiency improvements, these larger batteries might translate to substantial real-world gains for users.
What to watch next
Confirmations from Apple regarding battery specifications will clarify the leak’s accuracy and reveal how broadly these battery options will be deployed. Industry watchers should also monitor Samsung’s response, as rumors hint at an upcoming battery upgrade for the Galaxy S27 Ultra, which could maintain Samsung’s traditional lead in capacity numbers.
Meanwhile, attention should be paid to how Apple balances battery size with device thickness and weight, as well as software optimizations. The broader adoption of eSIM-only devices could reshape internal smartphone designs, enabling manufacturers to allocate space more flexibly, influencing the future of flagship device engineering.