I went through and force stopped every application that wasn't vital to the running process earlier. As well as deleted friendstream, task killer, battery time and disabled vibrate. on my D1 i had the screen very dim and it helped a lot, i could get over a day but I usually charged it over night, and that's with reading the internet and playing angry birds constantly. sigh. if it doesn't last through class tomorrow (2pm-5pm) I'm going to verizon.