The MagSafe Battery Pack has a 1,460mAh capacity at 7.62V. This translates to roughly 2,920mAh since the iPhone has a 3.81V rating. Since the battery pack sits external to the iPhone, it isn't ...
For instance, one user who set an 80% charge limit on their iPhone 15 Pro Max for a year observed that after 493 charge cycles, the battery retained an impressive 87% of its original capacity.