According to a support document released by Apple, due to the battery capacity of the iPhone 18 Pro Max exceeding 20Wh, the battery capacity will be limited to within 20Wh before delivery to customers to meet shipping requirements. After the customer receives and activates the device, the limitation is automatically lifted, allowing the battery to operate at its full capacity and provide longer battery life. If users need to send the device back for repairs, trade-in, or other purposes, they must manually enable the 'Prepare for Shipment' feature to limit the battery capacity.
