Well my replacement refurbished p4 came today . going over it i have to say it looks brand new . can see no signs it was used are refurbished in anyway . just put the battery on the charger . showing only 1 light same with the controller . once charged up i'll go through the start up procedures and make sure all works as it should . question where is the serial # can't seem to find it i do see a model #WM330A