Apple Watch Ultra 4 review: up to 60 hours of battery and Readiness without a subscription

The $799 Apple Watch Ultra 4 brings a new S11 chip, redesigned sensors and a Readiness score with no subscription. CNET's testing showed 60 hours of battery life with the always-on display, and up to 45 hours of workout tracking in Max Extended mode.

• Battery lasted 60 hours in CNET testing vs Apple's 50-hour claim
• Max Extended mode stretches workouts to 45 hours
• Readiness score runs 1-10 and shifts throughout the day
• Health and recovery metrics require no subscription