#watchOS

Replace the Battery or Buy a New One? Apple Watch's $99 Turning Point

A dying battery doesn't mean it's time to retire your watch. Apple's official $99 repair option, combined with watchOS support cutoffs, determines which models are worth saving—and which ones should just be replaced.

Tech

The ECG App Hiding Under Your Heart Rate Number: Most Apple Watch Users Have Never Opened It

Unlike the heart rate number you see every day, the ECG App on Apple Watch can trace the full electrical waveform of your heartbeat. Available on most models since Series 4, it's a feature few people know how to use or how to read.