As batteries grow more powerful to meet consumer demand, they increasingly brush against the boundaries of international transport law — and Apple's iPhone 18 Pro Max has crossed one such boundary. The device's battery exceeds 20 watt-hours, a threshold that triggers stricter lithium-ion shipping regulations, prompting Apple to engineer a firmware solution that quietly limits capacity during transit. It is a small but telling example of how the invisible architecture of global logistics shapes the design of the objects we carry in our pockets.