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Welcome to the forums!
How old is it?
Try these things
Please clean the contacts
http://help.fitbit.com/articles/en_US/Help_article/My-tracker-s-battery-isn-t-charging/?q=not+chargi...
Then Do a Restart
http://help.fitbit.com/articles/en_US/Help_article/1186/?q=restart&l=en_US&fs=Search&pn=1
Also See this thread for charging best practices. If you are not charging it correctly you could be damaging the battery
https://community.fitbit.com/t5/Charge/Fitbit-charge-battery-problems/m-p/1323307#M53291
http://help.fitbit.com/articles/en_US/Help_article/1799
If that does not help contact support
http://help.fitbit.com/?cu=1
Wendy | CA | Moto G6 Android
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
It's great to see you around @Drosealaniz and @WendyB thanks for stopping by.
Regarding to the battery issue you are experiencing with your Blaze, I recommend following the instructions provided by our friend here or you can also take a look at this post and follow the steps provided there.
I hope this helps, let me know the outcome. ![]()