Overview

• Series 11 adds tougher Ion‑X glass on aluminum models, a modestly larger battery, selective 5G on cellular versions, and a Space Gray finish.
• Apple’s move from an 18‑hour to a 24‑hour estimate is attributed largely to a new benchmark that includes extra sleep tracking time rather than a big hardware jump.
• 5G support is absent in many markets at launch, with Apple listing only 4G for countries such as Canada, Australia, New Zealand, Brazil, Mexico, and parts of Europe, South America, Africa, and Asia.
• Headline features like hypertension notifications and Sleep Score run on older watches via watchOS and regional approvals, so they are not exclusive to Series 11.
• Buyer’s guides advise most Series 10 owners to hold off, while Ultra 3 draws notice for satellite Emergency SOS and a longer battery rating.