Apple Watch Ultra 4: Battery Life and Readiness Tested

I examine the Apple Watch Ultra 4’s two key upgrades: longer workout battery options and a dynamic readiness score. Rather than reviewing every specification, I focus on hands-on tests and explain how these features may affect training and upgrade decisions.

■ Battery and workout testing
- Standard, extended, and maximum battery-saving modes; charging
■ Readiness and buying considerations
- How the score works, what it tracks, and its current limitations
- Comparisons with earlier Ultra models and Garmin sports watches

For anyone considering an Ultra 4, upgrading from an older Apple Watch, or choosing between a smartwatch and a dedicated sports watch, this overview provides practical points to weigh. Ultra 3 owners can also check whether the upcoming watchOS 27 update provides the battery modes they need before deciding to upgrade.