watchOS 9 introduces a new Low Power Mode for the Apple Watch Series 4 and later that is designed to extend battery life by disabling or limiting some features and sensors while enabled, such as the always-on display.
Specific features that are disabled or affected when Low Power Mode is turned on are outlined in a new support document.
Low Power Mode turns off these features- Always On display- Heart rate notifications for irregular rhythm, high heart rate, and low heart rate- Background heart rate measurements- Background blood oxygen measurements
- Start workout reminder
Low Power Mode turns off these features when your iPhone isn't nearby- Wi-Fi and cellular connections
- Incoming phone calls and notifications
Low Power Mode affects these features- Making a phone call can take longer- Background app refresh happens less frequently- Complications update less frequently- Siri can take longer to process a request
- Some animations and scrolling might appear less smooth
Apple says Fall Detection works in low power mode.
To turn on Low Power Mode, you must first open Control Center, then tap on the battery percentage button, and then use the watch face to make a gesture.
The Low Power Mode alert asks users if they want to turn on the feature when the Apple watch's battery percentage drops. Unless users manually turn on the Apple Watch for a set number of days, Low Power Mode will turn off automatically.
Low Power Mode can be turned on automatically when users start working out, with metrics such as heart rate and pace still being tracked.
When Low Power Mode is enabled, if you open an app that requires a data connection, you'll be able to use your phone's battery life to its fullest, which can cause significant battery consumption.
watchOS 9 is a free update for the Apple Watch Series 4. The Apple Watch's current Power Reserve mode only displays the clock when enabled, but the new Low Power Mode displays the clock when not in use.
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