I haven't had any issues, but my wife's Fitbit battery wouldn't stay charged for more than 2 days, within a month of getting it. Since her replacement came in,

I haven't had any issues, but my wife's Fitbit battery wouldn't stay charged for more than 2 days, within a month of getting it. Since her replacement came in, we've had no issues. My biggest complaint with the Fitbit is the lack of any battery meter on the device itself. Unless you sync frequently, you wouldn't know when your battery is running low.