Apple has implemented a firmware-based solution for the iPhone 18 Pro Max to comply with international shipping regulations that create challenges for batteries with cells larger than 20 watt-hours (Wh).
According to Apple, the device uses an innovative battery-firmware solution
that limits the battery’s capacity to below 20Wh from the time of manufacture until it is delivered to the customer. This software limitation is removed once the user activates the iPhone for the first time, granting access to the battery’s full rated capacity.
The eSIM-only model shipped in the U.S. has a rated capacity of 5,567mAh (21.75Wh), while the European version, which includes a physical SIM slot, is rated at 5,391mAh (21.06Wh). Both versions exceed the 20Wh threshold.
Regulatory Status and Industry Context
The U.S. transport regulator explicitly permitted this shipping method in June 2025, according to Gsmarena. While other bodies including ICAO, IATA, and ADR have not officially commented, the iPhone 18 Pro lineup is currently on sale in the European Union.
The need for such a workaround stems from a discrepancy in how single-cell and multi-cell batteries are treated. In 2026, the UN Sub-Committee of Experts on the Transport of Dangerous Goods reviewed a proposal noting that the 20Wh boundary is becoming obsolete, as the same cells can be used in multi-cell batteries that exceed the limit without the same restrictions. Regulatory bodies are working to update these policies in 2029.
The Prepare to Ship Feature
Because no other iPhone models utilize a single-cell battery exceeding 20Wh, the firmware limitation is exclusive to the iPhone 18 Pro Max. To accommodate users who must ship their devices for trade-ins, repairs, or other reasons, Apple introduced a Prepare to Ship
feature.
Located under Settings > General > Transfer or Reset iPhone > Prepare to Ship, this tool discharges the battery to below 20Wh and establishes a charge limit to maintain that threshold during transit. Apple notes that the device may become warmer than usual
during the discharge process. Once complete, the device displays a “Ready to Ship” status.
Users can undo this preparation through the same Settings menu, though Apple indicates there may be a 14-day waiting period before the limit can be disabled, depending on the reason selected for the shipping preparation.
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