I'm looking to buy a portable DVD player under $800 US, and I came across this baby. I have a few questions, and I was wondering how it compared to other players. I've read some reviews that state that the battery duration is only 2 hours, so is there another optional battery pack available? Also, how is the playback for MP3, VCD and SVCD discs? Does it play MP3s on DVD-R discs?