Apple Watch Ultra 4 for Races Over 24 Hours: Every Workout Battery Mode, and Where Training Load Fits

Apple Watch Ultra 4 publishes three workout battery ratings: up to 18 hours of outdoor workout, up to 25 hours in Extended Workout mode, and up to 45 hours in a new Max Extended Workout mode that records GPS at one-second intervals. Apple aims that top mode at 100-mile races. Ultra 4 rates up to 45 hours of tracking in Max Extended Workout mode....