09-17-2016 08:56
09-17-2016 08:56
09-25-2016 07:14
09-25-2016 07:14
@sarahliz Welcome to the Fitbit Community! I recommend following the steps on this post about batteries not charging correctly. Also, check how to maximize the battery life on your Fitbit Flex and check these charging best practices! All of that should fix the battery and it should last more. If you happen to see that it is still not working properly; report the problem to customer support for further assistance.
Let me know how it goes!