I just got my Droid ERIS today. Question: I can't recharge it using the plug but it will recharge using the USB cord. The salesguy told me that I am not supposed to turn this thing off, only put it in sleep mode. So if I am not going to use the DROID in the evening is it ok to just leave it on the USB charger? How can I get it to work on the AC/DC charger? Thanks!