Hi: I am trying to find an external battery that would provide power for about 15 to 20 hours of music. Another poster has suggested the Universal 9800 mAh external battery found at
www.dealextreme.com which can connect in via the UBS jack. I have queried the supplier as to suitabity but have not yet heard back. Do you have any suggestions? As I write this I am on (long) hold with Sony tech support. Thus far, none of their support folks have a clue. Ed