Hi @Emman
When using all day sync in the Fitbit App for the phone, consider turning it off to increase the battery life on the tracker & from the phone.
On the trackers settings page..
https://www.fitbit.com/settings/device/tracker/
Optionally check out the Fitbit Article: How do I maximize my tracker's battery life?
* If not already done, feel free to logout from the iOS app and login for getting the battery status from the account..
Hope it helps
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