Having the same problem. In the last week, my FB one has gone from keeping a charge for over a week, to keeping it for less than four hours.
Things I've tried:
Turning off all day sync
deleting and reinstalling the app
plugging device in and holding down button until Fitbit 6.60 appears
Went to bed last night with a full charge, woke up this am and it was totally drained.
Any helpful answers would be appreciated
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