# Trading in an iPhone 18 Pro Max means draining the battery first

Source: https://idevice.com/trading-in-an-iphone-18-pro-max-means-draining-the-battery-first
Published: 2026-09-19

> The Pro Max battery clears 20 watt-hours, so Apple added a Prepare to Ship step that discharges it before repair or trade-in, with an undo that can wait 14 days.

The [iPhone 18 Pro Max](https://idevice.com/phones/iphone-pro/roadmap/iphone-18-pro-max) is the first iPhone with a battery big enough to need its own shipping procedure. The single cell holds more than 20 watt-hours, which is the threshold that brings extra shipping requirements with it, so Apple built a switch into iOS that drains the battery under the line before the phone goes in a box. It is called Prepare to Ship, and you will meet it the first time you send the phone off for repair or trade-in.

MacRumors spotted the requirement in Apple's documentation on Friday. Apple's own phrase for the fix is an "innovative battery-firmware solution", and what it does is hold capacity under 20Wh from the factory to your front door. Activation lifts the cap. A phone still sealed in its box needs none of this, because it has never been switched on and is already under the limit.

Prepare to Ship sits in Settings, under General, then Transfer or Reset iPhone. Choosing it discharges the battery below 20Wh and pins a charge limit there so the phone stays under the threshold in transit, and Apple warns it can run "warmer than usual" while that happens. Settings shows a Ready to Ship status when it finishes. There is an undo in the same place, though depending on the reason you picked when you started it, that can sit behind a 14-day wait.

No other iPhone needs any of it. Apple says no other model ships with a single-cell battery over 20 watt-hours, and it makes the point that the Pro Max is safe to ship and safe to fly with exactly as it is. The firmware limit exists to satisfy the paperwork, not to fix a hazard.

Most people will meet this at trade-in. You back the phone up, you wipe it, you put it in the envelope, and now a step sits between the wipe and the envelope that takes real time and cannot be hurried. Start it the night before rather than on the way to the counter, and if you are shipping a phone for repair, start it before you need the phone to still be working.