NWZ-S544 and taging

Hello everybody, This is my second player and I’ve been very happy with it but Sony has not been very helpful with any of my questions. one of the reasons I bought this player was it’s being able to work with Windows media player 11. This is where the problems start. 1) Album art is saved in WMP 11 but when music is sent to my player some of the album art doesn’t make it to the player although it’s in the correct format (jpeg). I’ve always hit apply media info. 2) sony also says that the internal battery can be charged 500 times. Ok, what happens when the battery is charged out? Also, Is there any other software that tags the media info better, freeware or shareware? Thanks