The Apple Watch Ultra 3 is built to outlast every other watch Apple makes. Apple rates it for 42 hours of normal use. Mine didn’t last that long, and the battery wasn’t the culprit. I was. The always-on display was on. During most workouts, I’ve got GPS running. If I leave my phone upstairs, the watch flips to cellular on its own. My watch face was crowded with complications, each one pulling in fresh data. And it barely leaves my wrist, since I wear it overnight for sleep and health tracking, so it almost never sits on the charger long enough to fill up. Add all that together, and 42 rated hours shrinks fast. Four setting changes turned it around, and not one of them involved nursing the battery.
Turn off the always-on display
The single change that bought back the most hours
No Apple Watch has a bigger or brighter screen than the Ultra 3. With your wrist down, it still ticks over once a second to stay readable. That nonstop glow is what drains the battery faster than anything else you do in a day.
This one’s on the watch, not your phone. In the Watch app, head to Settings > Display & Brightness and switch off Always On. Now the screen goes dark until you raise your wrist or tap it.
Within a day, I’d stopped missing it. The flick to wake is quick, and the screen still lights up for taps and alerts, plus any time I start a workout. It only bugs me mid-workout, when my hands are full. A quick turn of the wrist brings it back.
Rein in Background App Refresh
Stop apps from updating when you’re not looking
Every app you open can keep checking for new data after you’ve moved on, quietly burning power in the background. Multiply that across a dozen apps, and it adds up over a full day. Trimming the list to what I actually use on my wrist made a clear difference.
The setting lives at Settings > General > Background App Refresh on the watch. You can switch it off entirely, or scroll down and disable it app by app. I left a couple of essentials on, like the weather, and shut off the rest.
One detail trips people up: any app with a complication on your current watch face keeps refreshing, no matter what you set here. If a thirsty app is still draining you after this change, check whether it’s sitting on your watch face as a complication. Swapping to a simpler face with fewer live complications quietly helps your battery for the same reason.
Trim notifications to the essentials
Fewer alerts means fewer screen wake-ups and haptics
Notifications are easy to overlook as a battery cost, but each one wakes that big display and fires the haptic motor. When you’re getting buzzed for every app on your phone, that’s dozens of small wake-ups across a day. I pared mine down to the handful that matter: messages, calls, calendar, and my home security alerts.
Open the Watch app on your iPhone and head to Notifications. Switch off whatever you don’t want buzzing your wrist. You can also swipe left on a notification on the watch itself and turn it off there.
One more change cuts screen time directly. Shorten how long the display stays lit after each glance: open Settings > Display & Brightness > Wake Duration and pick Wake for 15 Seconds over the longer setting. Trimming notifications is one of several underrated Apple Watch features worth setting up, and it makes a difference every day.
Keep Low Power Mode one tap away
Stretch a long day, and a long workout, without a charger
Low Power Mode is the safety valve. Turning it on drops the always-on display, pauses background heart rate and blood oxygen readings, holds off heart rate notifications, and limits some connectivity, while the watch keeps doing the basics. I reach for it on any day I forgot to top up overnight.
For an Ultra, the real payoff shows up during long workouts. Switch on Low Power Mode before a long hike or ride, and it shifts to fewer GPS and heart rate readings. That takes outdoor GPS tracking from around 14 hours up to 20 with full readings, or as far as 35 hours with cellular and reduced sampling. Over a long day outside, that extra runtime is the whole ballgame. You either get home with charge to spare, or you don’t.
Open Control Center with the side button, tap the battery percentage, and switch on Low Power Mode. It runs until you turn it off or the watch charges past 80%. I start workouts with the Action Button on the watch, and if you’ve set up the Action Button on your iPhone too, it’s worth a look.
Now it makes it through the day and the night
None of this touched the battery’s health, and it didn’t need to. These four changes cut the constant background draws, so the Ultra 3 once again clears a full day with enough left to track a night of sleep. What surprised me most was how little I gave up. The features I switched off were ones I wasn’t really using, and the watch feels no less capable for it. If you only change one thing, kill the always-on display first; it does the heaviest lifting. I’ve gotten good at squeezing more out of Apple gear this way, including the older Apple devices I gave new jobs around the house.
