How to use Low Power Mode on the Apple Watch
The Apple Watch has never been known for having long battery life. Case in point: Apple never budgeted from the 18-hour battery life estimate until it launched the Apple Watch Ultra. But with watchOS 9, the company has introduced a new Low Power Mode to help extend the time between charges.
Previously, the Apple Watch had a Power Reserve mode, which shut off any functions aside from your ability to tell time and turned your smartwatch into a “dumb” one until you could get it onto a charger. This new mode is different — it’s more like the iPhone’s Low Power Mode. When enabled, you’ll still be able to use your Apple Watch, but certain power-hungry features will be turned off or limited to conserve the battery.
On the Apple Watch, Low Power Mode disables the always-on display and limits sensor readings like background heart rate and blood oxygen monitoring. (You should be aware it also disables irregular heart rhythm notifications, as well as high and low heart rate notifications.)
Low Power Mode also curves LTE and Wi-Fi connectivity. While you’ll still be able to send messages or make calls from your watch, it’ll only fetch notifications about once an hour. As a result, you might miss timely texts and emergency alerts.
However, if you’re in the middle of a workout, don’t worry — heart rate and GPS will be unaffected. Another option that reduces heart rate and GPS sampling is also in the works but is currently unavailable.