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Have you tried these solutions?
http://help.fitbit.com/articles/en_US/Help_article/1190
Also See @LanuzaFitbit advise here
https://community.fitbit.com/t5/One/my-fitbit-one-will-not-keep-a-charge/m-p/1685939#M62390
Let us know!
Wendy | CA | Moto G6 Android
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