Here are instructions how to recover after changing routers.
With respect to the battery issue, I suggest that you refrain from Factory Reset without further consult, however, there is another type of reset that may resolve your issue. Remove ROAM from the charger then press and hold the power button for 15 seconds. If your finger slips off the button, restart the 15 second interval. The ROAM should respond. Now place the unit back on the charger and fully charge the unit.
Also make sure that you are using a proper charger and that the charger is functioning.