Anyone have any good battery saving techniques? And does 'Batter Saver Mode' make the phone perform noticably slower than say, Smart Mode? Also, I downloaded the Advanced Task Killer because my verizon rep told me to. After doing a little reasearch though, I heard that having this actually kills the battery faster because it is constantly running. Is it better or worse to have this? And again, please share any tips to help save battery life longer?