How to use Low Power Mode on the Apple Watch

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.

What Low Power Mode does

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 curtails 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.

This mode is a great option if you’ve got an aging Apple Watch but aren’t looking to upgrade (since battery life is often why people buy new watches). Your mileage may vary, however. Battery life depends heavily on individual usage, and your watch’s battery health is also a factor. You can only squeeze so much out of Low Power Mode if your battery has significantly degraded over the years.

As with the iPhone version, you’ll be automatically prompted to turn on Low Power Mode once your battery power hits 10 percent. But some people, especially those with Ultras, might want to be more intentional in how they use the feature — for example, if they’re participating in an Ironman and need at least 12 hours or so of GPS and activity tracking. On the Ultra, Apple says Low Power Mode can stretch battery life up to 60 hours. (Though, based on our testing, you may get well beyond that.)

Enabling Low Power Mode

First things first — to use Low Power Mode, you’ll need to have watchOS 9. That means this feature is only available for the Apple Watch Series 4 or later. If you have an older watch and you think this feature is worthwhile, you may want to consider upgrading.

In any case, assuming your Watch is equipped with watch OS 9, you can enable the feature in two ways.

Using Control Center

The quickest way is through your watch’s Control Center.

Swipe up to access it, then find the battery percentage tile and tap it.
You should see a readout of how much battery you have left. Tap the Low Power Mode toggle to turn it on. You’ll then see an explainer about which features are turned off in this mode, which will pop up each time you toggle it on.
From there, you can tap Turn On or Turn On For... The former enables the mode for an indefinite period. The latter will give you the option to temporarily turn it on for one, two, or three days.