Apple Watch Ultra 4 Review Highlights Improved Battery Life and New Health Sensors

The new Apple Watch Ultra 4 features redesigned ECG electrodes and optical sensors that improve measurement accuracy and deliver more actionable health data. On the back, the device carries more electrodes and sensors than earlier models. These changes enable heart-rate updates every five seconds alongside a two-minute heart-rate history, and also improve recovery heart rate variability calculations for sleep and daytime measurements.

Battery Performance

Despite the new sensor hardware, the Ultra 4 lasts for two full days under regular use with an active cellular connection. Users can stretch that runtime to nearly four days by turning on low power mode, helping ease long-standing battery anxiety.

Software and Siri

The watch runs watchOS 27, which makes finding apps easier by suggesting most-used apps when the crown is pressed while keeping Siri central. Siri is now more contextual, allowing users to ask for quick explainers on topics like biohacking. An always-listening mode helps, though Audio Intelligence features have not reached all users yet.

Buying Advice and Pricing

The Apple Watch Ultra 4 starts at Rs 1,09,900. Reviewer Nandagopal Rajan recommends the device as an upgrade for users on a regular Apple Watch or for first-time buyers with a higher budget, noting that owners of older Ultra models do not need to replace their devices annually.

Context

Wearable health gadgets like smartwatches and smart rings increasingly track detailed biometric data such as heart rate variability to help users monitor personal wellness and fitness trends over time. These devices rely on optical sensors and electrical nodes placed against the skin to capture continuous physiological signals throughout the day and night.