Fitbit support was very helpful and apologetic about the issues I was having, the first replacement did not charge. Support requested I send it back saying they would send another replacement as soon as they received the first replacement. They never sent it out until I emailed them asking if they had received the first replacement. The support asked for my address to send out the second replacement, they claimed it would be sent Fedex 2nd day air it was sent ou May 2, I received May 22 the second one did not charge either.
I am still using the Yolo knockoff which has been more reliable and accurate.