The iPhone 18 Pro Max features a single-cell battery with a capacity of 21.063 Wh (SIM) or 21.751 Wh (eSIM). Both capacities exceed the 20 Wh limit set for transportation. In a support document, Apple clarifies that the iPhone 18 Pro Max’s firmware restricts its battery capacity to 20 Wh from manufacturing until its first activation. Additionally, there is an option to engage a special mode if the iPhone 18 Pro Max needs to be shipped later, such as for repairs, returns, or resale.
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In Settings > General > Transfer or Reset iPhone, there is a new “Prepare for Shipping” option that must be selected before sending the iPhone. Apple states that enabling this mode limits the battery to 80% of its capacity for 14 days. Upon activating this feature, the iPhone may need to discharge its battery, and Apple notes that this could cause the device to heat up during the process.
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Ethan Rivers focuses on Android smartphones, emerging mobile platforms, and operating systems. With a critical yet fair perspective, he evaluates devices on performance, design, and ecosystem compatibility.