iPhone 18 Pro Max battery is so big it needs shipping mode
Apple’s longest-lasting iPhone has picked up an unusual side effect: its battery is now large enough to trigger extra shipping requirements. The iPhone 18 Pro Max therefore comes with a new Prepare to Ship setting that deliberately reduces its usable battery capacity before the phone is posted.
For owners, the important bit is simple: you don’t need to use it when flying with the phone. Apple says the battery is safe for normal use and air travel. The feature only applies when the handset itself is being shipped for a repair, trade-in, return, sale or gift.
If the battery is full, the phone may take a couple of hours to get ready. It may also get warmer as it discharges, which Apple says is expected and not a problem.
And if you’re trading the phone in or returning it, the system can restrict charging to 80% for 14 days to keep it below the threshold.
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Apple has crossed the 20Wh line
Apple states the iPhone 18 Pro Max has «greater than» 20 watt-hours (Wh) of battery capacity. Some of the simpler transport exemptions that apply to smaller consumer batteries do not cover lithium-ion cells above 20 Wh.
Owners can go to Settings → General → Transfer or Reset iPhone → Prepare to Ship. The phone then drains itself enough to cross the threshold and shows a red ‘Ready to Ship’ badge when it is done.
If it hasn’t already been erased, you can carry the phone as it drains. And if the process doesn’t work, Apple specifically warns that you shouldn’t simply put the handset in a box and send it anyway.
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Trade-off for best battery life
Apple also claims up to 30 hours of typical use on the Pro Max, while five minutes on a sufficiently powerful wired charger can provide around seven hours of video playback.
In the UK, Apple rates the iPhone 18 Pro Max for up to 43 hours of video playback, compared with 36 hours for the smaller Pro. The US eSIM-only version goes even further, with Apple quoting up to 45 hours, because removing the physical SIM tray leaves more room for battery capacity.
Read more: iPhone 18 Pro Max vs Galaxy S26 Ultra: Which is worth the price tag?
That endurance does come with a physical price: the Pro Max weighs 249g, against 211g for the regular iPhone 18 Pro. Early hands-on testing highlighted that weight as one of the clearest everyday trade-offs for buyers choosing the larger model.
