Apple Watch Series 9 won't stay shut down

Watch series 9 wont stay shut down.

I only have an Apple watch so that I can check if I have atrial fibrillation. I don't use a watch for anything else.

When the watch is in my bag and I need to check my ECG, it's dead as the battery has run out.

How can I keep it shut down so that there is battery power when I need it?

iPhone 13 Pro Max

Posted on Jun 26, 2026 11:51 AM

Reply
17 replies

Jun 26, 2026 2:12 PM in response to Aarniluppo

Do you power off the Apple Watch when you’re not using it? You should.


To power it off, press and hold the side button until the power off screen appears, then tap the power button in the upper right and slide the power off entry on the resulting display.


To power it back on, press and hold the side button briefly until the Apple logo appears.

Jun 27, 2026 11:01 AM in response to Aarniluppo

Aarniluppo wrote:
There is at least in my Apple watch series 9 with OS 26.5 a Settings app, the cogwheel and there is General and in General the last option is Shut Down. Tapping it come a slide Power Off, do you mean that this is not a Power Off option?

This will work when you do it on your Apple Watch - use Settings, etc. on the Apple Watch and not the iPhone. Surely the button method of shutting down that Jeff Donald and I described are similar.

Jun 26, 2026 2:56 PM in response to Aarniluppo

If the ONLY thing you are using this for is ECG/Afib detection, you might want to consider if this your best option. I really like my watch (my second one), and it is very good for some thing, but the ECG function isn’t necessarily one of them. There are other inexpensive products on the market that do a better job. You should consult with your healthcare provider.

Jun 26, 2026 4:04 PM in response to Aarniluppo

For AFib screening, the Apple Watch works best when worn as much as possible, because Apple says the irregular rhythm notification feature only checks your heartbeat occasionally and is not constantly watching for AFib. That means wearing it full time increases the chances it will catch an episode, but it still cannot detect every instance.


For AFib History, Apple is more specific. You need a physician diagnosis of AFib, and you should wear the watch at least 12 hours a day for 5 days a week to get consistent estimates. Low Power Mode can interfere because it turns off background heart measurements.


Apple says irregular rhythm notifications are designed to run when you’re still and are not constant background monitoring, so a watch worn only part time is less likely to notice an episode.


The EKG app uses a one wire lead. The only thing it can detect is AFib and you basically must wear it all the time, to increase accuracy and acquire a useful history. The app and Watch cannot detect heart attacks because it only has one lead.


Track your AFib History with Apple Watch - Apple Support


Heart health notifications on your Apple Watch - Apple Support

Jun 26, 2026 10:56 PM in response to Kilgore-Trout

I'm oldfashioned and like to have things simple. I had earlier an Awario unit that was more precise, like "doctor quality", but it sent the measurements somewhere and then returned back with a file of ECG. Precise, but complicated. I had no problem that the measurement was sent somewhere. When I wake up and feel bad, I just want to get a quick diagnose. With Apple watch I see immediately what is the status of my ECG and can decide what to do. But I'll check what is available.

Jun 26, 2026 11:10 PM in response to Jeff Donald

When I get AFib, I feel bad and can by just checking my pulse from the wrist determine if I have an AFib.

With the Apple watch I can verify how bad it is, should I just wait if it go away or should I go to hospital.

I have been "re-booted" several times, once with some medicine and that was scary, you are awake and feel that your heart slowly stop. Normally they put you to sleep and start with electricity, that's what they told me.


I see no reason to monitor my ECG constantly, the only problem I have now is that when I need the watch to what is going on, it's dead.


There are so many series of Apple watch and different OS, some wrote that with the new series watch, Apple decided that users can not actually shut the watch down. I have no idea it this is true or not, but as my watch is usually dead, I think it's true? Mine is series 9.

Jun 26, 2026 11:35 PM in response to Aarniluppo

Aarniluppo wrote:
When I get AFib, I feel bad and can by just checking my pulse from the wrist determine if I have an AFib.
With the Apple watch I can verify how bad it is, should I just wait if it go away or should I go to hospital.

That is absolutely incorrect.


From this article:

Track your AFib History with Apple Watch - Apple Support


  • ”Apple Watch cannot detect a heart attack or stroke. If you ever experience chest pain, pressure, tightness, or what you think is a heart attack, call emergency services immediately.
  • Apple Watch only checks for signs of atrial fibrillation periodically. AFib History may not find every instance of your irregular rhythm.
  • AFib History does not notify you when you're experiencing AFib.“


Apple decided that users can not actually shut the watch down.

That is also completely incorrect. All Apple Watches can be shut down as I described above.

Jun 27, 2026 7:07 AM in response to sberman

A quite bold statement! Have you had AFib, do you know what I'm talking about?

  • I'm not trying to check if I have a hearth attack or stroke
  • I'm not interested to periodically check my hearth beat or it's irregularities and AFib history

When I feel bad and suspect that I have an AFib, I can with the watch confirm that it's an AFib and nothing else and decide what to do.


Please tell me how my use of Apple watch is absolutely incorrect?


Make me wonder why when I put the watch away for couple of weeks and try to us it, it's dead?

Perhaps my watch is broken?

I have no other use for the watch, only to check the ECG.

Jun 27, 2026 7:58 AM in response to Aarniluppo

The Apple Watch is cleared/qualified to detect signs of AFib in two main, medically recognized ways. The irregular rhythm notification, and ECG app, which have FDA 510(k) clearance for identifying possible AFib.


Second, the AFib History feature, which the FDA has qualified under its Medical Device Development Tools (MDDT) program to estimate AFib burden for use as a biomarker/secondary endpoint in clinical trials for people already diagnosed with AFib.


The feature is intended for users 22+ with a prior AFib diagnosis and requires regular wear (Apple’s guidance describes minimum wear-time expectations for reliable estimates). It’s designed to provide weekly estimates of AFib burden for use in research and clinical conversations.


If you’re not going to wear it and use it for its intended purpose I guess you’re benefiting from it’s placebo effect.

Jun 27, 2026 11:12 AM in response to Aarniluppo

Aarniluppo wrote:
With the Apple watch I can verify how bad it is, should I just wait if it go away or should I go to hospital.

Rather than question my credentials, I am offering this advice to you, and you should believe it. If you choose not to, that’s your prerogative.


Your Apple Watch should not be used to determine whether or not you should go to a hospital at the moment. The ECG can report whether or not you’re having Atrial Fibrillation at the moment. You can share that data with your medical professional. But the Apple Watch cannot provide data to answer “If my Apple Watch shows me this specific reading, things have suddenly gotten very bad and I need medical attention immediately.”


Jun 27, 2026 1:04 PM in response to Jeff Donald

Perhaps we're misunderstandig each other here? Some people have AFib that they don't recognise, in these cases it can be benefical to wear the watch constantly so it can determine from collected symptoms that now the wearer has AFib. I have no idea if this is the way the Apple watch work, but my AFib are something I do recognise, the hearth beat is so high.

One reason for me checking if AFib is still on and how long it has been is that there is a possibility that blood clot in hearth chambers and can then cause cerebral infarction. I have medication to prevent clotting.

Apple Watch Series 9 won't stay shut down

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