Been using my new 6G with a Sony bluetooth dongle (model TMR-BT8iP) and love the freedom of no cords. Kept track today and got the low battery warning at about 3hr20min of constant play with limited times using the screen (3X), and the ipod shut down about 15 minutes later. Just curious what battery lives others are getting and which dongle they're using. Do some suck more juice than others?