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…
Running
Apple Watch Ultra 4 vs Series 12 for Runners: 10 vs 18, 25 and 45 Workout Hours, L1 vs Dual-Frequency GPS
For a runner, two lines on Apple’s spec sheets separate Apple Watch Ultra 4 from Apple Watch Series 12: workout battery and GPS. Series 12 is rated for up to 10 hours of outdoor workout with Precision L1 GPS, while Ultra 4 is rated for 18 hours, 25 hours in Extended Workout and 45 hours…

