My battery is in the camera and fully charged, but the device will not turn on.

Check the direction you inserted the battery. Batteries for any device typically only work when installed properly and this device is no different. There should be an asymmetric group of gold colored terminals on one end of the battery. Be sure when reinserting the battery into the device that those match up with their counterparts in the battery compartment of the camera. For a more detailed look at this, see the battery guide we've set up for you.