I am looking to sell my current MP3 player and use my D X as my main music source. Search as I might, I have not been able to find a thread here or in any other site that provides expected battery performance from someone listening to music all day long on their phone. So can a few of you that do this provide a little info into what I can expect if I make this move? I currently use Winamp but I am not against using another app. I have the standard battery but I am seriously looking into getting the extended battery along with a 32GB micro sd card. I will likely also get a second charger for my desk but I am concerned about the battery for when I am away from my desk or car for a while, like during a flight. As for my battery's current performance, it is acceptable at best. I do use Tweetdeck and surf the internet all day, watch some videos and play a couple of games. It usually survives my work day from 8AM to 5PM. Any info you can provide would be appreciated.