Ultra 4: Longer Battery, Deeper Health Insights Arrive

The Apple Watch Ultra 4 has arrived, targeting the dedicated sports watch market with a new processor and advanced sensors. These updates unlock more frequent health measurements, provide innovative recovery insights, and introduce AI-powered audio tools, all without requiring a monthly subscription. The most significant upgrade may be the battery life, which has been extended by at least 10 hours in testing due to a larger battery and a more power-efficient processor. Additionally, new power-saving options cater to endurance athletes.

The Ultra 4 features a redesigned sensor array with 32 electrodes, capturing ECG readings with greater surface area. Combined with the new S11 processor, it enables heart-rate readings every 5 seconds and heart-rate variability (HRV) measurements every 5 minutes. This increased data collection feeds into the new Readiness score, a measure of the body's preparedness for the day and workouts. While functional, this score is not as dynamic as some competitors and currently lacks robust historical trend analysis or specific consideration for women's menstrual cycles.

Battery performance is a key highlight, with the Ultra 4 delivering up to 60 hours of normal use, exceeding Apple's estimate. Extended Workout modes can push tracking to 25 hours or even 45 hours in a Max Extended mode, sacrificing some metrics for longevity. Although it still doesn't match the multi-week battery life of some dedicated sports watches, these modes offer crucial runtime for endurance events. New AI-driven audio features include faster music recognition and sound alerts, with future capabilities for transcribing and summarizing conversations, though privacy concerns remain.

Ultimately, the Apple Watch Ultra 4 offers a compelling blend of advanced health tracking, improved battery life, and subscription-free metrics, making it a strong contender for both endurance athletes and those seeking a more capable smartwatch. While its rugged design may not suit all users for daily wear, the enhanced features present a significant upgrade, particularly for those coming from older Ultra models.