Fitbit charge manual download free. The manual concludes by explaining how to restart your Charge in the event you encounter difficulty with your tracker. All other troubleshooting suggestions, as well as detailed information about how Fitbit trackers and services work, can be found in the articles at pastabar Each time you open the Fitbit app, it syncs automatically if the paired tracker is nearby. You can also use the Sync Now option in the app at any time. Fitbit Connect syncs every 15 minutes if the tracker is within 20 feet of the computer.