While an autopsy, undertaken the same day Presley died, was still in progress, Memphis medical examiner Dr. Jerry Francisco announced that the immediate cause of death was cardiac arrest. Asked if drugs were involved, he declared that drugs played no role in Presley's death.
Power Reserve notification (left), Charging the Apple Watch (middle and right). As for charge times, Apple says it takes about 1.5 hours to reach 80% and up to 2.5 hours for a full 100% charge. Real-world Watch battery performance.
To charge your Apple Watch: 1  Plug the Apple Magnetic Charging Cable, Apple Watch Magnetic Charging Case, or Apple Watch Magnetic Charging Dock into its USB power adapter. 2  Plug the adapter into a power outlet. 3  Position the back of your Apple Watch on the charger.  Give your Apple Watch time to charge.