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iPhone 18 Pro Max’s battery is so big Apple had to add this new feature to iOS 27

Apple introduced a Prepare to Ship feature in iOS 27 specifically for the iPhone 18 Pro Max. The device requires this battery drain process before shipping because its battery capacity exceeds 20Wh. This capacity threshold triggers additional shipping requirements that the new software feature addresses. While the iPhone 18 Pro series supports fast-charging adapters, the Pro Max model is the only one mentioned as requiring this specific pre-shipping battery state.

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  • ✓ The iPhone 18 Pro Max includes a Prepare to Ship feature.
  • ✓ The iPhone 18 Pro Max battery exceeds 20Wh.
🛡️ Source Corroboration: 6 independent reporting domains (90% confidence) ⏱ Read time: ~2 min

What changed

Apple implemented a Prepare to Ship feature in iOS 27 to manage the iPhone 18 Pro Max battery.

Live updates

  1. iPhone 18 Pro Max adds Prepare to Ship feature for battery compliance

    Apple introduced a Prepare to Ship feature in iOS 27 specifically for the iPhone 18 Pro Max. The device requires this battery drain process before shipping because its battery capacity exceeds 20Wh. This capacity threshold triggers additional shipping requirements that the new software feature addresses. While the iPhone 18 Pro series supports fast-charging adapters, the Pro Max model is the only one mentioned as requiring this specific pre-shipping battery state.

    Why it matters

    Shipping regulations often impose strict limits on the charge level of high-capacity lithium batteries to ensure safety during transit. By automating the drain process, Apple ensures the Pro Max meets these legal standards before leaving the warehouse.

    What is confirmed

    • The iPhone 18 Pro Max includes a Prepare to Ship feature.
    • The iPhone 18 Pro Max battery exceeds 20Wh.

    Still unconfirmed

    • The iPhone 18 Pro Max battery was tested against the Galaxy S26 Ultra.
    • iPhone 18 Pro buyers need a power adapter.

    What to watch next

    • Official confirmation of iOS 27 battery management specifications
    • Detailed shipping regulation requirements for batteries over 20Wh
    Sources used for this update (6)
    1. MacRumors — iPhone 18 Pro Max Requires 'Prepare to Ship' Battery Drain Before Shipping
    2. Gizmodo — iPhone 18 Pro Buyers Need a Power Adapter, and Apple’s 20W USB-C Charger Is a Record-Low Steal on Amazon
    3. 9to5Mac — iPhone 18 Pro Max’s battery is so big Apple had to add this new feature to iOS 27
    4. bgr.com — 4 Of The Best 60W Fast-Charging Adapters For The iPhone 18 Pro Series
    5. PhoneArena — I tested the iPhone 18 Pro Max battery against the Galaxy S26 Ultra, and I did not expect this
    6. www.theapplepost.com — iPhone 18 Pro Max adds new ‘Prepare to Ship’ feature because its battery is so large
    confidence 90%
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