There was a post on this a year ago which has been closed. I am on the latest app and iOS versions. I think this issue might have started (again) with the recent 4.44 update. I have "background app refresh" turned off and never leave the app on the screen although I don't generally force close it. For the last few days the Fitbit app has been the biggest battery user although the screen time is low. This morning the battery stats since my last charged showed 4 min of screen time and 59 minutes background so "background app refresh" set to off is not working.
Based on the previous post, the issue apparently comes and goes with each update. Quite annoying since it forces me to charge my phone more often than I should have to.
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