With watchOS 9 on the Apple Watch Ultra, Apple introduced a new battery feature called Optimized Charge Limit, which uses on-device machine learning to analyze your daily usage and dynamically set ...

A fast-charging puck will not work when paired with Apple Watch Series 6, it will merely charge at the standard speed.

The $400 Apple Watch Series 6 brings advancements like blood oxygen readings, a brighter always-on display, and faster charging.