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.
Charge times are from 0% to 80% and from 0% to 100% using the included MagSafe inductive charger. Charge time varies with environmental factors; actual results will vary. Apple Watch battery performance claims are based on test results from the 38mm Apple Watch.