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