Apple Firmware Lock Sidesteps iPhone Battery Shipping Limit — SkimNews
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- Apple built a "battery-firmware solution" into the iPhone 18 Pro Max that keeps capacity below the 20Wh single-cell limit imposed by international shipping regulations until first boot.
- iPhone 18 Pro Max automatically removes the firmware lock upon user activation, restoring rated capacity to roughly 21.75Wh on US eSIM-only models and 21.06Wh on European models with a physical SIM slot.
- Apple's "Prepare to Ship" feature, found under Settings > General > Transfer or Reset iPhone, re-applies the 80% charging cap for 14 days when users need to send the device for repair or resale.
- Apple warns the iPhone 18 Pro Max battery might need to discharge and could run warmer than usual during the Prepare to Ship process, and the feature can be disabled at any time.
- Android manufacturers have historically sidestepped the same shipping rules by using smaller dual-cell batteries outside Asia — an approach Apple describes as costlier and less space-efficient than its firmware method.
- Apple's firmware approach could pressure Android vendors to adopt a software-based workaround if it proves viable, replacing the dual-cell hardware compromise.
Why it matters: The firmware trick lets Apple ship a single ~21.75Wh cell that exceeds the 20Wh shipping cap only after the user owns it, sidestepping the hardware trade-off Android makers absorb with dual cells. Consumers get the repair/resale safeguard of Prepare to Ship plus automatic full capacity on activation — a software-only path that, if it works, could reset how the industry designs large phone batteries.
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