I know we have the same exact player. This is mine, check out my seller.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=006&sspagename=STRK%3AME WN%3AIT&viewitem=&item=160064463905&rd=1&rd=1
This is a video of my player shutting off after reaching main menu and showing battery with red X. I know our original firmware wasn't the 9.0.48 I remeber before trying to upgrade it said 9.0.50 in the upgrade utility.
http://www.youtube.com/watch?v=wAuGwqBqPlQ