What is MagSafe alignment accuracy and why does a 1mm shift slow charging?

MagSafe wireless charging relies on magnetic coils aligning perfectly. A magsafe charging coil alignment shift of even 1mm increases resistance.

This resistance wastes energy, turning it into heat. As the phone heats up, its thermal safeguards throttle charging speed down to 5W or less. Accurate magnetic alignment rings are essential to maintain maximum charging speeds.