How To Change Battery In A Eclipse T2800 media player?

The Eclipse T2800 portable Mp3 Media Player - The Only Way It Does Anything At All , Is When I Plug The Power Adapter In To The Wall & Plug The USB Charging Cable Into The T2800 - The LED Screen Says ( Loading... ) & Never Finishes Loading , &  Will Not Power Off Or On At All.      Do You Think It's A Battery Problem / Or Something Is Wrong With The Player Itself .Any Advice , Suggesting & Or Help You Can Provide Would Greatly Appreciated.Thank You    Mr.   G.