According to official support documentation, Apple restricts the iPhone 18 Pro Max battery capacity. During assembly and before customer delivery, the capacity remains capped under 20Wh. Upon receiving and activating the device, this restriction lifts automatically. Consequently, the battery unlocks its full charging potential. This allows the smartphone to deliver significantly extended battery life.
Understanding the Battery Restriction
Apple implements this battery capacity lock primarily for transportation safety. Specifically, stringent aviation regulations limit the air transit of high-capacity batteries. Other models lack single-cell batteries exceeding 20Wh. Therefore, they do not require this specific capacity-locking feature. As a result, this remains an exclusive capability for the iPhone 18 Pro Max.
Why You Should Avoid Manual Locking
Users can manually lock the battery capacity within the settings menu. However, you should never attempt this unless absolutely necessary. Even casual testing can cause significant inconvenience. Technicians primarily use this feature for post-sales repairs or equipment shipping. Once activated, you might wait up to 14 days to restore maximum capacity. During this restrictive period, you must endure a significantly smaller battery allowance.
Activating the Shipping Mode
You can activate this feature manually before shipping your device. Simply navigate to Settings, General, Transfer or Reset, and select Prepare for Shipping. Upon activation, the system intentionally consumes power rapidly. Consequently, the entire device temperature will rise noticeably. Furthermore, this preparation process takes considerable time to complete. We strongly advise users to avoid using the device during this phase. Eventually, the system will confirm the “ready for shipping” status.
Ensuring Safe Courier Transit
Currently, courier companies have not explicitly mandated this battery lock for air freight. Nevertheless, we highly recommend enabling this function before mailing your phone. Ultimately, prioritizing transportation safety is always the best approach. You should use this feature whether sending the device for repair or mailing it to a friend.
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