苹果为 iPhone 18 Pro Max 配备的单芯电池容量超过 20Wh，因此新增了"准备发运"功能 1。该功能可将电池能量主动放电至 20Wh 以下，以满足多数国家和地区的运输要求 1。用户可在"设置>通用>传输或还原iPhone>准备发运"中启用此功能 1。放电过程可能需数分钟至数小时，期间设备发热属正常现象 1。
这一功能主要应用于设备维修、折抵换购、退货或寄送等场景 1。值得注意的是，新设备从生产到交货期间电池容量已限制在 20Wh 以下，激活后限制自动解除 1。在维修、折抵换购或退货情景下，系统还会在 14 天内将充电上限限制为 80% 1。由于其他 iPhone 机型未采用容量超过 20Wh 的单芯电池，因此不需执行此流程 1。
Apple has added a new "Prepare for Shipping" function to the iPhone 18 Pro Max to meet international transportation regulations for lithium batteries. 1 The feature addresses the device's single-cell battery, which has a capacity exceeding 20Wh—a threshold set by most countries and regions for safe shipping. 1 When activated, the function actively discharges the battery to below 20Wh, a process that may take from several minutes to several hours depending on the current charge level. 1
The new capability becomes relevant when users need to service, trade in, return, or ship their devices. 1 During the discharge process, the iPhone may become warmer than usual, which Apple notes is normal behavior. 1 From production through delivery to customers, the iPhone 18 Pro Max ships with battery capacity already restricted to below 20Wh; this limitation is automatically removed upon device activation. 1 Users can access the feature through Settings > General > Transfer or Reset iPhone > Prepare for Shipping. 1 In repair, trade-in, or return scenarios, the system will additionally cap the charging limit at 80 percent for up to 14 days. 1 Other iPhone models do not require this procedure, as they do not use single-cell batteries with capacity exceeding 20Wh. 1
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